diff --git a/data_structure/add_id.py b/data_structure/add_id.py
index 682ff04..8ee40e4 100644
--- a/data_structure/add_id.py
+++ b/data_structure/add_id.py
@@ -116,7 +116,7 @@ for filename in md_filenames:
                 "id": code,
                 "index": index,
                 "isFirst": index == 0,
-                "isLast": index == len(md_filenames) - 1,
+                "isLast": position == len(subjects[subject_index]),
                 "title": subjects[subject_index][index],
                 "subject": subject_index,
                 "files": [{"filename": filename, "version": version}],
diff --git a/data_structure/topics.json b/data_structure/topics.json
index a63d8a9..de2ae9b 100644
--- a/data_structure/topics.json
+++ b/data_structure/topics.json
@@ -47,7 +47,7 @@
                 "id": "F0_55",
                 "index": 54,
                 "isFirst": false,
-                "isLast": false,
+                "isLast": true,
                 "title": "Алергия. Алергични заболявания. Анафилактичен шок. Поведение на медицинската сестра при спешни алергични състояния.",
                 "subject": 0,
                 "files": [
@@ -1102,7 +1102,7 @@
                 "id": "F1_21",
                 "index": 20,
                 "isFirst": false,
-                "isLast": false,
+                "isLast": true,
                 "title": "Лекарствени средства, действащи върху храносмилателната система – апетитостимулиращи, апетитопотискащи (анорексигенни), противоповръщащи (антиеметични), противоязвени (антиулкусни).",
                 "subject": 1,
                 "files": [
diff --git a/reader/src/icons/Icons.jsx b/reader/src/icons/Icons.jsx
index 6746171..3230aa5 100644
--- a/reader/src/icons/Icons.jsx
+++ b/reader/src/icons/Icons.jsx
@@ -30,6 +30,92 @@ export function TitleIcon({ className }) {
   );
 }
 
+export function JustifyTextIcon({ className }) {
+  return (
+    <svg
+      className={className}
+      xmlns="http://www.w3.org/2000/svg"
+      height="24px"
+      viewBox="0 0 24 24"
+      width="24px"
+      fill="inherit"
+    >
+      <path d="M0 0h24v24H0V0z" fill="none" />
+      <path d="M14 17H4v2h10v-2zm6-8H4v2h16V9zM4 15h16v-2H4v2zM4 5v2h16V5H4z" />
+    </svg>
+  );
+}
+
+export function TextIncreaseIcon({ className }) {
+  return (
+    <svg
+      className={className}
+      xmlns="http://www.w3.org/2000/svg"
+      enableBackground="new 0 0 24 24"
+      height="24px"
+      viewBox="0 0 24 24"
+      width="24px"
+      fill="inherit"
+    >
+      <rect fill="none" height="24" width="24" />
+      <path d="M0.99,19h2.42l1.27-3.58h5.65L11.59,19h2.42L8.75,5h-2.5L0.99,19z M5.41,13.39L7.44,7.6h0.12l2.03,5.79H5.41z M20,11h3v2h-3 v3h-2v-3h-3v-2h3V8h2V11z" />
+    </svg>
+  );
+}
+
+export function TextDecreaseIcon({ className }) {
+  return (
+    <svg
+      className={className}
+      xmlns="http://www.w3.org/2000/svg"
+      enableBackground="new 0 0 24 24"
+      height="24px"
+      viewBox="0 0 24 24"
+      width="24px"
+      fill="inherit"
+    >
+      <rect fill="none" height="24" width="24" />
+      <path d="M0.99,19h2.42l1.27-3.58h5.65L11.59,19h2.42L8.75,5h-2.5L0.99,19z M5.41,13.39L7.44,7.6h0.12l2.03,5.79H5.41z M23,11v2h-8 v-2H23z" />
+    </svg>
+  );
+}
+
+export function HRuleIcon({ className }) {
+  return (
+    <svg
+      className={className}
+      xmlns="http://www.w3.org/2000/svg"
+      enable-background="new 0 0 24 24"
+      height="24px"
+      viewBox="0 0 24 24"
+      width="8px"
+      fill="inherit"
+    >
+      <g>
+        <rect fill="none" fill-rule="evenodd" height="24" width="24" />
+        <g>
+          <rect fill-rule="evenodd" height="2" width="16" x="4" y="11" />
+        </g>
+      </g>
+    </svg>
+  );
+}
+
+export function VRuleIcon({ className = "" }) {
+  return (
+    <svg
+      className={`rotate-90 ${className}`}
+      xmlns="http://www.w3.org/2000/svg"
+      height="24px"
+      viewBox="0 0 8 24" // Match the 8px width
+      width="8px"
+      fill="inherit"
+    >
+      <rect fillRule="evenodd" height="2" width="8" x="0" y="11" />
+    </svg>
+  );
+}
+
 export function EllipsisIcon({ className = "" }) {
   return (
     <svg
diff --git a/reader/src/main.jsx b/reader/src/main.jsx
index 948680e..e58875a 100644
--- a/reader/src/main.jsx
+++ b/reader/src/main.jsx
@@ -14,6 +14,10 @@ import {
   WidthIcon,
   EllipsisIcon,
   CloseIcon,
+  JustifyTextIcon,
+  TextIncreaseIcon,
+  TextDecreaseIcon,
+  VRuleIcon,
 } from "./icons/Icons";
 
 createRoot(document.getElementById("root")).render(
@@ -72,7 +76,9 @@ export function TopicListView() {
 
   return (
     <>
-      <div className="flex-1 overflow-y-scroll pb-[156px]">
+      <div
+        className={`flex-1 overflow-y-scroll ${selectedTopic === null ? "pb-[92px]" : "pb-[156px]"}`}
+      >
         {topics.map((topic, i) => (
           <Link
             key={topic.id}
@@ -96,7 +102,7 @@ export function TopicListView() {
           </Link>
         ))}
       </div>
-      <div className="absolute bottom-0 p-4 pb-6 w-full flex flex-col">
+      <div className="absolute bottom-0 p-4 w-full flex flex-col">
         <div className="ml-auto p-2 flex space-x-1 h-[60px]">
           <button
             className={`cursor-pointer p-2 rounded-full text-white border ${config.displayTitle ? "bg-blue-100 border-blue-400" : "bg-gray-100 border-gray-400"}`}
@@ -164,7 +170,7 @@ export function TopicListView() {
         {selectedTopic !== null && (
           <Link
             to={`/${selectedTopic.id}`}
-            className="w-full p-2 bg-blue-600 hover:bg-blue-700 cursor-pointer truncate rounded-md text-sm text-white text-center shadow-md transition-colors"
+            className="w-full p-2 mb-2 bg-blue-600 hover:bg-blue-700 cursor-pointer truncate rounded-md text-sm text-white text-center shadow-md transition-colors"
           >
             <span>Продължи четенето:</span>
             <br />
@@ -208,24 +214,59 @@ export function Reader({ topic }) {
   return (
     <>
       <div className="flex-1">
-        <PDFViewer file={topic.files[selectedVersion]} compact={config.narrowMode} />
+        <PDFViewer
+          file={topic.files[selectedVersion]}
+          compact={config.narrowMode}
+          justifyText={config.justifyText}
+        />
         <div className="absolute bottom-10 flex justify-between px-4 py-2 w-full z-999">
           <div className="flex w-full space-x-2">
             <Link to="/" className="cursor-pointer p-2 rounded-full bg-blue-600 text-white mr-auto">
               <MenuBookIcon className="fill-gray-100" />
             </Link>
           </div>
-          <div className="flex space-x-1">
+          <div className="flex items-center">
+            <div className="text-sm text-gray-600 rounded bg-gray-300/30 backdrop-blur px-2">
+              {config.contentZoomLevel}%
+            </div>
+
             <button
-              className={`cursor-pointer p-2 rounded-full text-white border ${config.displayTitle ? "bg-blue-100 border-blue-400" : "bg-gray-100 border-gray-400"}`}
+              className={`cursor-pointer p-2 mx-1 rounded-full text-white bg-gray-100/30 backdrop-blur`}
+              onClick={() =>
+                changeConfig({ contentZoomLevel: Math.max(50, config.contentZoomLevel - 10) })
+              }
+            >
+              <TextDecreaseIcon className="fill-gray-600" />
+            </button>
+
+            <button
+              className={`cursor-pointer p-2 rounded-full text-white bg-gray-100/30 backdrop-blur`}
+              onClick={() => {
+                changeConfig({ contentZoomLevel: Math.min(150, config.contentZoomLevel + 10) });
+              }}
+            >
+              <TextIncreaseIcon className="fill-gray-600" />
+            </button>
+
+            <VRuleIcon className="fill-gray-300" />
+
+            <button
+              className={`cursor-pointer p-2 mr-1 rounded-full text-white border ${config.displayTitle ? "bg-blue-100 border-blue-400" : "bg-gray-100 border-gray-400"}`}
               onClick={() => changeConfig({ displayTitle: !config.displayTitle })}
             >
               <TitleIcon className="fill-gray-600" />
             </button>
 
+            <button
+              className={`cursor-pointer p-2 mr-1 rounded-full text-white border ${config.justifyText ? "bg-blue-100 border-blue-400" : "bg-gray-100 border-gray-400"}`}
+              onClick={() => changeConfig({ justifyText: !config.justifyText })}
+            >
+              <JustifyTextIcon className="fill-gray-600" />
+            </button>
+
             {window.innerWidth > 576 && (
               <button
-                className={`cursor-pointer p-2 rounded-full text-white border ${config.narrowMode ? "bg-blue-100 border-blue-400" : "bg-gray-100 border-gray-400"}`}
+                className={`cursor-pointer p-2 mr-1 rounded-full text-white border ${config.narrowMode ? "bg-blue-100 border-blue-400" : "bg-gray-100 border-gray-400"}`}
                 onClick={() => changeConfig({ narrowMode: !config.narrowMode })}
               >
                 <WidthIcon className="fill-gray-600" />
@@ -308,7 +349,8 @@ export function Reader({ topic }) {
   );
 }
 
-export function PDFViewer({ file, compact }) {
+export function PDFViewer({ file, compact, justifyText }) {
+  const iframeRef = useRef(null);
   const [content, setContent] = useState(null);
   const htmlContent = useMemo(() => {
     const fileContent = `
@@ -330,12 +372,18 @@ export function PDFViewer({ file, compact }) {
                   padding: 0 12px 40px;
                   ${compact ? "max-width: 36rem; margin: 0 auto;" : ""}
                 }
-                p {
-                  text-align: justify;
-                  text-justify: inter-word;
-                }
-                pre, code {
-                  font-family: 'SF Mono', Menlo, Monaco, Consolas, 'Liberation Mono', 'Courier New', monospace;
+                ${
+                  justifyText
+                    ? `
+                  p {
+                    text-align: justify;
+                    text-justify: inter-word;
+                  }
+                  pre, code {
+                    font-family: 'SF Mono', Menlo, Monaco, Consolas, 'Liberation Mono', 'Courier New', monospace;
+                  }
+                `
+                    : ""
                 }
               </style>
             </head>
@@ -345,10 +393,18 @@ export function PDFViewer({ file, compact }) {
             </html>
           `;
     return fileContent;
-  }, [content, compact]);
+  }, [content, compact, justifyText]);
   const [isLoading, setIsLoading] = useState(true);
   const [error, setError] = useState(null);
 
+  const contentZoomLevel = useStore((state) => state.config.contentZoomLevel);
+
+  useEffect(() => {
+    if (iframeRef.current && iframeRef.current.contentDocument) {
+      iframeRef.current.contentDocument.body.style.zoom = `${contentZoomLevel}%`;
+    }
+  }, [contentZoomLevel]);
+
   useEffect(() => {
     const fetchFile = async () => {
       try {
@@ -387,11 +443,17 @@ export function PDFViewer({ file, compact }) {
   return (
     <div className={`w-full h-full overflow-hidden`}>
       <iframe
+        ref={iframeRef}
         srcDoc={htmlContent}
         title={`File: ${file}`}
         className="w-full h-full border-0"
         key={file}
         allow="fullscreen"
+        onLoad={() => {
+          if (iframeRef.current?.contentDocument?.body) {
+            iframeRef.current.contentDocument.body.style.zoom = `${contentZoomLevel}%`;
+          }
+        }}
       />
     </div>
   );
diff --git a/reader/src/main.jsx.bak b/reader/src/main.jsx.bak
deleted file mode 100644
index d5851d4..0000000
--- a/reader/src/main.jsx.bak
+++ /dev/null
@@ -1,326 +0,0 @@
-import { StrictMode, useLayoutEffect, useRef, useState, useEffect } from "react";
-import { createRoot } from "react-dom/client";
-import { useParams, Navigate, BrowserRouter, Link, Outlet, Route, Routes } from "react-router";
-import "./index.css";
-import { useShallow } from "zustand/shallow";
-import { useStore } from "./store.js";
-import {
-  ArrowBackIcon,
-  ArrowForwardIcon,
-  MenuBookIcon,
-  MyLocationIcon,
-  TitleIcon,
-  WidthIcon,
-} from "./icons/Icons";
-
-createRoot(document.getElementById("root")).render(
-  <StrictMode>
-    <BrowserRouter>
-      <Routes>
-        <Route path="/" element={<Layout />}>
-          <Route index element={<TopicListView />} />
-          <Route path=":topicId" element={<FileReader />} />
-        </Route>
-      </Routes>
-    </BrowserRouter>
-  </StrictMode>,
-);
-
-function Layout() {
-  const params = useParams();
-  const topic = useStore((state) => params.topicId && state.topics.byId[params.topicId]);
-  const config = useStore((state) => state.config);
-
-  return (
-    <div className="max-w-7xl mx-auto h-full relative flex flex-col">
-      {config.displayTitle && (
-        <div className="w-full px-4 py-2 font-medium text-large text-white bg-blue-600">
-          <span>{topic ? `${topic.index + 1}: ${topic.title}` : "Конспект за Държавен Изпит"}</span>
-        </div>
-      )}
-      <Outlet />
-    </div>
-  );
-}
-
-export function TopicListView() {
-  const itemRefs = useRef({});
-  const topics = useStore(
-    useShallow((state) => state.topics.allIds.map((id) => state.topics.byId[id])),
-  );
-  const selectedTopic = useStore((state) => state.selectedTopic);
-  const selectTopic = useStore((state) => state.selectTopic);
-
-  useLayoutEffect(() => {
-    if (selectedTopic && selectedTopic.id !== null) {
-      itemRefs.current?.[Math.max(selectedTopic.index - 3, 0)].scrollIntoView();
-    }
-  }, [selectedTopic]);
-
-  return (
-    <>
-      <div className="flex-1 overflow-y-scroll">
-        {topics.map((topic, i) => (
-          <Link
-            key={topic.id}
-            ref={(node) => {
-              itemRefs.current[i] = node;
-            }}
-            to={`/${topic.id}`}
-            onClick={() => selectTopic(topic.id)}
-            className={`flex px-2 py-1 rounded-md cursor-pointer border-l-4 ${topic.id === selectedTopic?.id ? "bg-blue-100 border-blue-500" : "border-transparent hover:bg-gray-100"}`}
-          >
-            <div
-              className={`w-6 flex-shrink-0 flex font-medium justify-end ${topic.id === selectedTopic?.id ? "text-blue-600" : "text-blue-800"}`}
-            >
-              {i + 1}
-            </div>
-            <span className="ml-2">
-              <span
-                className={`leading-5 ${topic.id === selectedTopic?.id ? "font-medium" : "font-normal"}`}
-              >
-                {topic.title}
-              </span>
-            </span>
-          </Link>
-        ))}
-        {selectedTopic !== null && (
-          <div className="sticky bottom-0 p-4 w-full flex flex-col">
-            <div className="w-full flex justify-between items-center gap-2">
-              <Link
-                to={`/${selectedTopic.id}`}
-                className="w-full p-2 bg-blue-600 hover:bg-blue-700 cursor-pointer truncate rounded-md text-sm text-white text-center shadow-md transition-colors"
-              >
-                <span>Продължи четенето:</span>
-                <br />
-                <span className="font-medium">{selectedTopic.title}</span>
-              </Link>
-              <button
-                className="px-3 py-3 bg-teal-500 hover:bg-teal-300 cursor-pointer rounded-full flex items-center justify-center shadow-md transition-colors"
-                onClick={() => {
-                  itemRefs.current?.[Math.max(selectedTopic.index - 3, 0)].scrollIntoView({
-                    behavior: "smooth",
-                  });
-                }}
-              >
-                <MyLocationIcon className="h-5 w-5" />
-              </button>
-            </div>
-          </div>
-        )}
-      </div>
-    </>
-  );
-}
-
-export function FileReader() {
-  const params = useParams();
-  const topicsById = useStore((state) => state.topics.byId);
-  const selectTopic = useStore((state) => state.selectTopic);
-
-  const topic = topicsById[params.topicId];
-  if (!topic) {
-    return <Navigate to="/" replace />;
-  }
-
-  selectTopic(topic.id);
-
-  return <Reader topic={topic} />;
-}
-
-export function Reader({ topic }) {
-  console.log("render!");
-  const config = useStore((state) => state.config);
-  const changeConfig = useStore((state) => state.changeConfig);
-  const selectedVersion = useStore((state) => state.topicVersions[topic.id] ?? 0);
-  const selectVersion = useStore((state) => state.selectTopicVersion);
-  const getTopicAtIndex = useStore((state) => state.getTopicAtIndex);
-
-  const prevTopic = getTopicAtIndex(topic.index - 1);
-  const nextTopic = getTopicAtIndex(topic.index + 1);
-
-  return (
-    <>
-      <div className="flex-1">
-        <PDFViewer file={topic.files[selectedVersion]} compact={config.narrowMode} />
-        <div className="absolute bottom-10 flex justify-between px-4 py-2 w-full z-999">
-          <div className="flex space-x-2">
-            <Link to="/" className="cursor-pointer p-2 rounded-full bg-blue-600 text-white">
-              <MenuBookIcon className="fill-gray-100" />
-            </Link>
-            <button
-              className={`cursor-pointer p-2 rounded-full text-white border ${config.displayTitle ? "bg-blue-100 border-blue-400" : "bg-gray-100 border-gray-400"}`}
-              onClick={() => changeConfig({ displayTitle: !config.displayTitle })}
-            >
-              <TitleIcon className="fill-gray-600" />
-            </button>
-            {window.innerWidth > 576 && (
-              <button
-                className={`cursor-pointer p-2 rounded-full text-white border ${config.narrowMode ? "bg-blue-100 border-blue-400" : "bg-gray-100 border-gray-400"}`}
-                onClick={() => changeConfig({ narrowMode: !config.narrowMode })}
-              >
-                <WidthIcon className="fill-gray-600" />
-              </button>
-            )}
-          </div>
-          {topic.files.length > 1 && (
-            <div className="flex space-x-1">
-              {topic.files.map((file, vIndex) => (
-                <button
-                  key={file}
-                  className={`flex-1 cursor-pointer px-2 py-1 rounded-md text-xs whitespace-nowrap ${
-                    selectedVersion === vIndex
-                      ? "bg-blue-100 text-blue-800 font-medium"
-                      : "bg-gray-100 hover:bg-gray-200"
-                  }`}
-                  onClick={() => selectVersion(topic.id, vIndex)}
-                >
-                  Версия {vIndex + 1}
-                </button>
-              ))}
-            </div>
-          )}
-        </div>
-      </div>
-      <div className="w-full flex flex-col space-y-2">
-        <div className="flex bg-gray-100 border-t border-blue-200 text-center">
-          {topic.isFirst ? (
-            <div className="flex-1 border-r border-blue-200" />
-          ) : (
-            <Link
-              to={`/${prevTopic.id}`}
-              className="border-r border-blue-200 w-1/2 flex-1 px-4 py-2 hover:bg-blue-200 cursor-pointer flex align-center justify-start"
-            >
-              <ArrowBackIcon />
-              <span className="ml-2 truncate w-full ">
-                {prevTopic.index + 1}: {prevTopic.title}
-              </span>
-            </Link>
-          )}
-          {topic.isLast ? (
-            <div className="flex-1" />
-          ) : (
-            <Link
-              to={`/${nextTopic.id}`}
-              className="flex-1 px-4 py-2 hover:bg-blue-200 w-1/2 cursor-pointer flex align-center justify-end"
-            >
-              <span className="mr-2 w-full truncate">
-                {nextTopic.index + 1}: {nextTopic.title}
-              </span>
-              <ArrowForwardIcon />
-            </Link>
-          )}
-        </div>
-      </div>
-    </>
-  );
-}
-
-export function PDFViewer({ file, compact }) {
-  const [content, setContent] = useState(null);
-  const [isLoading, setIsLoading] = useState(true);
-  const [error, setError] = useState(null);
-
-  useEffect(() => {
-    const fetchFile = async () => {
-      try {
-        setIsLoading(true);
-        const response = await fetch(`/files_html/${file}`);
-
-        if (!response.ok) {
-          throw new Error(`Failed to load file: ${response.status}`);
-        }
-
-        let fileContent = await response.text();
-
-        // If no head tag, add a basic HTML structure with fonts
-        fileContent = `
-            <!DOCTYPE html>
-            <html>
-            <head>
-              <meta charset="UTF-8">
-              <meta name="viewport" content="width=device-width, initial-scale=1.0">
-              <link rel="stylesheet" href="https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap">
-              <style>
-                body {
-                  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
-                  line-height: 1.5;
-                  color: #333;
-                  -webkit-font-smoothing: antialiased;
-                  -moz-osx-font-smoothing: grayscale;
-                  padding-bottom: 40px;
-                }
-                pre, code {
-                  font-family: 'SF Mono', Menlo, Monaco, Consolas, 'Liberation Mono', 'Courier New', monospace;
-                }
-              </style>
-            </head>
-            <body>
-              ${fileContent}
-            </body>
-            </html>
-          `;
-
-        setContent(fileContent);
-        setError(null);
-      } catch (err) {
-        console.error("Error loading file:", err);
-        setError(err.message);
-      } finally {
-        setIsLoading(false);
-      }
-    };
-
-    fetchFile();
-  }, [file]);
-
-  if (error) {
-    return <div className="text-red-500 p-4 border border-red-300 rounded">Error: {error}</div>;
-  }
-
-  if (isLoading) {
-    return <DelayedLoader />;
-  }
-
-  return (
-    <div className={`w-full h-full overflow-hidden ${compact ? "max-w-xl mx-auto" : ""}`}>
-      <iframe
-        srcDoc={content}
-        title={`File: ${file}`}
-        className="w-full h-full border-0"
-        key={file}
-        allow="fullscreen"
-      />
-    </div>
-  );
-}
-
-const DelayedLoader = ({
-  delayMs = 2000,
-  className = "p-4 flex justify-center items-center h-40",
-  text = "Loading...",
-}) => {
-  const [showLoader, setShowLoader] = useState(false);
-
-  useEffect(() => {
-    // Set a timeout to show the loader after the specified delay
-    const timer = setTimeout(() => {
-      setShowLoader(true);
-    }, delayMs);
-
-    // Clear the timeout on unmount
-    return () => clearTimeout(timer);
-  }, []); // Empty dependency array - only run on mount
-
-  // Only render if the delay has passed
-  if (showLoader) {
-    return (
-      <div className={className}>
-        <div className="animate-pulse">{text}</div>
-      </div>
-    );
-  }
-
-  // Return null before delay threshold
-  return null;
-};
diff --git a/reader/src/store.js b/reader/src/store.js
index 9bd5a3d..f10f6fa 100644
--- a/reader/src/store.js
+++ b/reader/src/store.js
@@ -1,10 +1,15 @@
 import { create } from "zustand";
 import structure from "./topics.json";
 
+const localSubject = localStorage.getItem("subject") || 0;
+
 export const useStore = create((set, get) => ({
-  subject: 0,
-  selectSubject: (id) => set({ subject: id, topics: structure[id] }),
-  topics: structure[0],
+  subject: localSubject,
+  selectSubject: (id) => {
+    set({ subject: id, topics: structure[id] });
+    localStorage.setItem("subject", id);
+  },
+  topics: structure[localSubject],
   topicVersions: {},
   getTopicAtIndex: (index) => {
     const topicId = get().topics.allIds[index];
@@ -22,10 +27,25 @@ export const useStore = create((set, get) => ({
       set({ selectedTopic: topic });
     }
   },
-  config: {
+  config: getLocalConfig(),
+  changeConfig: (config) => {
+    const newConfig = { ...get().config, ...config };
+    set({ config: newConfig });
+
+    localStorage.setItem("config", JSON.stringify(newConfig));
+  },
+}));
+
+function getLocalConfig() {
+  const defaultConfig = {
     displayTitle: true,
     wrapTopicTitles: false,
     narrowMode: true,
-  },
-  changeConfig: (config) => set({ config: { ...get().config, ...config } }),
-}));
+    justifyText: false,
+    contentZoomLevel: 100,
+  };
+  const config_str = localStorage.getItem("config");
+  const config = config_str ? JSON.parse(config_str) : {};
+
+  return { ...defaultConfig, ...config };
+}
diff --git a/reader/src/topics.json b/reader/src/topics.json
index a63d8a9..de2ae9b 100644
--- a/reader/src/topics.json
+++ b/reader/src/topics.json
@@ -47,7 +47,7 @@
                 "id": "F0_55",
                 "index": 54,
                 "isFirst": false,
-                "isLast": false,
+                "isLast": true,
                 "title": "Алергия. Алергични заболявания. Анафилактичен шок. Поведение на медицинската сестра при спешни алергични състояния.",
                 "subject": 0,
                 "files": [
@@ -1102,7 +1102,7 @@
                 "id": "F1_21",
                 "index": 20,
                 "isFirst": false,
-                "isLast": false,
+                "isLast": true,
                 "title": "Лекарствени средства, действащи върху храносмилателната система – апетитостимулиращи, апетитопотискащи (анорексигенни), противоповръщащи (антиеметични), противоязвени (антиулкусни).",
                 "subject": 1,
                 "files": [
diff --git a/reader/src/topics.json.bak b/reader/src/topics.json.bak
deleted file mode 100644
index ecce9cb..0000000
--- a/reader/src/topics.json.bak
+++ /dev/null
@@ -1,714 +0,0 @@
-{
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-            ],
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