diff --git a/angular.json b/angular.json
index b86db1fe77dbe8a155c3701b0d3e410507b46ec8..d109071a53ca7e13a25df694b60b47c3543dc1a9 100644
--- a/angular.json
+++ b/angular.json
@@ -23,11 +23,17 @@
             ],
             "styles": [
               "src/styles.scss",
-              "./node_modules/material-design-icons/iconfont/material-icons.css"
+              "./node_modules/material-design-icons/iconfont/material-icons.css",
+              "node_modules/prismjs/themes/prism-okaidia.css",
+              "node_modules/prismjs/plugins/line-highlight/prism-line-highlight.css",
+              "node_modules/prismjs/plugins/line-numbers/prism-line-numbers.css"
             ],
             "scripts": [
               "node_modules/marked/lib/marked.js",
               "node_modules/emoji-toolkit/lib/js/joypixels.min.js",
+              "node_modules/prismjs/prism.js",
+              "node_modules/prismjs/components/prism-csharp.min.js",
+              "node_modules/prismjs/components/prism-css.min.js",
               "node_modules/prismjs/plugins/line-highlight/prism-line-highlight.js",
               "node_modules/prismjs/plugins/line-numbers/prism-line-numbers.js",
               "node_modules/katex/dist/katex.min.js"
diff --git a/src/app/app.module.ts b/src/app/app.module.ts
index 9aaf493fdb9fc8651a9ae96330a5a316b9fd1b2e..67cd297df6add9d93a47f3730bc367ad699fc1d7 100644
--- a/src/app/app.module.ts
+++ b/src/app/app.module.ts
@@ -125,7 +125,13 @@ export function initializeApp(appConfig: AppConfig) {
       markedOptions: {
         provide: MarkedOptions,
         useValue: {
-          sanitize: true
+          pedantic: false,
+          gfm: true,
+          breaks: true,
+          sanitize: false,
+          smartLists: true,
+          smartypants: true,
+          xhtml: false
         }
       }
     }),
diff --git a/src/app/components/creator/_dialogs/room-edit/room-edit.component.html b/src/app/components/creator/_dialogs/room-edit/room-edit.component.html
index cbcd9da2b489fd76e74b7071f7180d3bf1535717..734041e4ef037c6bd716d4339057061f64f4852b 100644
--- a/src/app/components/creator/_dialogs/room-edit/room-edit.component.html
+++ b/src/app/components/creator/_dialogs/room-edit/room-edit.component.html
@@ -51,7 +51,8 @@
       </mat-tab>
       <mat-tab label="{{'session.preview' | translate}}"
                [disabled]="!editRoom.description">
-        <markdown [data]="editRoom.description"></markdown>
+        <markdown class="images" katex emoji lineNumbers lineHighlight
+          [data]="editRoom.description"></markdown>
       </mat-tab>
     </mat-tab-group>
     <div fxLayoutAlign="center center">
diff --git a/src/app/components/creator/room-creator-page/room-creator-page.component.html b/src/app/components/creator/room-creator-page/room-creator-page.component.html
index eaf734408eedda04f6bed6c3183f3e7ef30b34f3..951a099f107ff2a811c2ba3c8f14304046b9eecf 100644
--- a/src/app/components/creator/room-creator-page/room-creator-page.component.html
+++ b/src/app/components/creator/room-creator-page/room-creator-page.component.html
@@ -77,7 +77,8 @@
       </div>
       <mat-card-content *ngIf="room.description"
                         fxLayoutAlign="center">
-        <markdown [data]="room.description.trim()"></markdown>
+        <markdown class="images" katex emoji lineNumbers lineHighlight
+          [data]="room.description.trim()"></markdown>
       </mat-card-content>
       <div fxLayout="column"
            fxLayoutAlign="center"
diff --git a/src/app/components/moderator/room-moderator-page/room-moderator-page.component.html b/src/app/components/moderator/room-moderator-page/room-moderator-page.component.html
index d03cf13b0f4c93b402da3d05acb9fd0d134df896..77eaf139ae0c0d7f96958b6a16c82b1647f1b80e 100644
--- a/src/app/components/moderator/room-moderator-page/room-moderator-page.component.html
+++ b/src/app/components/moderator/room-moderator-page/room-moderator-page.component.html
@@ -35,7 +35,8 @@
       <mat-divider></mat-divider>
       <mat-card-content *ngIf="room.description"
                         fxLayoutAlign="center">
-        <markdown [data]="room.description.trim()"></markdown>
+        <markdown class="images" katex emoji lineNumbers lineHighlight
+          [data]="room.description.trim()"></markdown>
       </mat-card-content>
       <div fxLayout="column"
            fxLayoutAlign="center"
diff --git a/src/app/components/participant/room-participant-page/room-participant-page.component.html b/src/app/components/participant/room-participant-page/room-participant-page.component.html
index ee603de0bd35c49bba5823dd808d170899af145d..b7d127ee8643824e54ea2d6cb07e4d443894c93a 100644
--- a/src/app/components/participant/room-participant-page/room-participant-page.component.html
+++ b/src/app/components/participant/room-participant-page/room-participant-page.component.html
@@ -21,7 +21,8 @@
       </div>
       <mat-divider></mat-divider>
       <mat-card-content *ngIf="room.description" fxLayoutAlign="center">
-        <markdown [data]="room.description.trim()"></markdown>
+        <markdown class="images" katex emoji lineNumbers lineHighlight
+          [data]="room.description.trim()"></markdown>
       </mat-card-content>
       <mat-grid-list cols="1" rowHeight="2:1">
         <mat-grid-tile>
diff --git a/src/app/components/shared/_dialogs/motd-temp-dialog/motd-temp-dialog.component.html b/src/app/components/shared/_dialogs/motd-temp-dialog/motd-temp-dialog.component.html
index d8186fd8951735d03dff44ba551c933aca2c9a98..fa5fdaa2349aaab8f2c9fdd448b9154c16d47cd2 100644
--- a/src/app/components/shared/_dialogs/motd-temp-dialog/motd-temp-dialog.component.html
+++ b/src/app/components/shared/_dialogs/motd-temp-dialog/motd-temp-dialog.component.html
@@ -7,7 +7,8 @@
 </ars-row>
 <mat-dialog-content class="container" ars-flex-box>
   <ars-row ars-flex-box>
-    <markdown class="images" [data]="content"></markdown>
+    <markdown class="images" katex emoji lineNumbers lineHighlight
+              [data]="content"></markdown>
   </ars-row>
   <ars-row [height]="32"></ars-row>
   <ars-fill></ars-fill>
diff --git a/src/app/components/shared/comment-answer/comment-answer.component.html b/src/app/components/shared/comment-answer/comment-answer.component.html
index fdd4f031a9a4786508e2311f34e51e3ff401bfb8..e96bc84b6a25d5cb7bc5c7f4b48b67822a3bfa75 100644
--- a/src/app/components/shared/comment-answer/comment-answer.component.html
+++ b/src/app/components/shared/comment-answer/comment-answer.component.html
@@ -11,7 +11,8 @@
     <mat-card class="answer border-answer"
               *ngIf="!isStudent || answer">
       <div *ngIf="(isStudent || !edit) && answer">
-        <markdown [data]="answer"></markdown>
+        <markdown class="images" katex emoji lineNumbers lineHighlight
+          [data]="answer"></markdown>
         <div fxLayout="row"
              fxLayoutAlign="end">
           <button mat-raised-button
@@ -52,7 +53,8 @@
         </mat-tab>
         <mat-tab label="{{'session.preview' | translate}}"
                  [disabled]="!answer">
-          <markdown [data]="answer"></markdown>
+          <markdown class="images" katex emoji lineNumbers lineHighlight
+            [data]="answer"></markdown>
         </mat-tab>
       </mat-tab-group>
       <div fxLayout="row"
diff --git a/src/app/components/shared/header/header.component.html b/src/app/components/shared/header/header.component.html
index 6184ca014676f48aed356782fb14c9ad409a02e3..cefb9bee83800eb9406d4879bc42ee8663df3e19 100644
--- a/src/app/components/shared/header/header.component.html
+++ b/src/app/components/shared/header/header.component.html
@@ -17,9 +17,7 @@
     </h2>
 
 
-    <ng-container *ngIf="room && room.closed">
-      <h1>{{'header.questions-blocked'|translate}}</h1>
-    </ng-container>
+
 
     <ars-style-btn-material
       [ngClass]="{'noOfQuestions': deviceType === 'desktop'}"
@@ -122,15 +120,7 @@
           <!-- Question board -->
           <ng-container *ngIf="router.url.endsWith('/comments')">
 
-            <button mat-menu-item
-                    *ngIf="user && !router.url.endsWith('moderator/comments') && ((user.role > 0) || ((user.role == 0) && room && !room.closed))"
-                    tabindex="0"
-                    (click)="navigateCreateQuestion();">
-              <mat-icon>
-                add
-              </mat-icon>
-              <span>{{'header.create-question' | translate}}</span>
-            </button>
+
 
             <ng-container>
 
@@ -348,15 +338,7 @@
         <span>{{'header.delete-account' | translate}}</span>
       </button>
 
-      <ng-container *ngIf="shortId && user && user.role > 0">
-        <button mat-menu-item
-                (click)="blockQuestions()"
-                [ngClass]="{'color-warn': room.closed}"
-                tabindex="0">
-          <mat-icon class="color-warn">block</mat-icon>
-          <span>{{'header.block' | translate}}</span>
-        </button>
-      </ng-container>
+
 
       <button mat-menu-item
               (click)="logout()"
diff --git a/src/app/components/shared/questionwall/question-wall/question-wall.component.html b/src/app/components/shared/questionwall/question-wall/question-wall.component.html
index e4bfc4f2e959fb31d928027c15fa373ef57a6281..cae420d7988319960459a8bc665ea6d3da7a765b 100644
--- a/src/app/components/shared/questionwall/question-wall/question-wall.component.html
+++ b/src/app/components/shared/questionwall/question-wall/question-wall.component.html
@@ -115,7 +115,8 @@
             </ars-row>
             <ars-row>
               <ars-row class="bound" style="padding:16px 32px 16px 32px;box-sizing:border-box;max-width:100%;">
-                <markdown [ngStyle]="{'font-size':fontSize+'%'}" class="questionwall-present-markdown" [data]="commentFocus.comment.body"></markdown>
+                <markdown [ngStyle]="{'font-size':fontSize+'%'}" class="questionwall-present-markdown" class="images" katex emoji lineNumbers lineHighlight
+                          [data]="commentFocus.comment.body"></markdown>
               </ars-row>
             </ars-row>
             <ars-row [height]="50">
@@ -220,7 +221,8 @@
                   (click)="focusComment(comment)"
                   style="box-sizing:border-box;padding:0 16px;cursor:pointer">
                   <p class="questionwall-comment-body">
-                    <markdown [data]="comment.comment.body"></markdown>
+                    <markdown class="images" katex emoji lineNumbers lineHighlight
+                      [data]="comment.comment.body"></markdown>
                   </p>
                 </ars-row>
                 <ars-row [height]="50">
diff --git a/src/app/components/shared/questionwall/question-wall/question-wall.component.scss b/src/app/components/shared/questionwall/question-wall/question-wall.component.scss
index df024156e568c7d7ce0bf2726e503f730ddb5f0c..61c7abdadfd35de1f6accdad80415db75d6f93ec 100644
--- a/src/app/components/shared/questionwall/question-wall/question-wall.component.scss
+++ b/src/app/components/shared/questionwall/question-wall/question-wall.component.scss
@@ -181,6 +181,7 @@
           justify-content: center;
           hyphens: auto;
           word-break: break-word;
+          color: yellow;
         }
 
         &-inner {
diff --git a/src/app/components/shared/questionwall/question-wall/question-wall.component.ts b/src/app/components/shared/questionwall/question-wall/question-wall.component.ts
index 8148af8a71b5aeea0174ddd555730624f52af07c..a7f95f09f38f7b7d25c48d4f13023486b0801b80 100644
--- a/src/app/components/shared/questionwall/question-wall/question-wall.component.ts
+++ b/src/app/components/shared/questionwall/question-wall/question-wall.component.ts
@@ -47,7 +47,7 @@ export class QuestionWallComponent implements OnInit, AfterViewInit, OnDestroy {
   userList = [];
   userSelection = false;
   tags;
-  fontSize = 250;
+  fontSize = 180;
   periodsList = Object.values(Period);
   period: Period = Period.ALL;