diff --git a/landingpage/index.html b/landingpage/index.html
index 22be3572609709af4a8cf1352df9046a005b045a..9c869a50fc2059050769f17d3d0a4f03f5f8c893 100644
--- a/landingpage/index.html
+++ b/landingpage/index.html
@@ -53,7 +53,7 @@
                 <h2>Introduction</h2>
                 <div class="info-article info-article--video highlighted">
                     <div class="info-article__media">
-                        <iframe class="info-article__media--youtube" src="https://www.youtube.com/embed/6LOnEMBuW0I" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>
+                        <iframe class="info-article__media--youtube" src="https://www.youtube.com/embed/6LOnEMBuW0I" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; fullscreen"></iframe>
                     </div>
                 </div>
                 <div class="info-article info-article--text">
@@ -85,12 +85,12 @@
                 </div>
                 <div class="info-article info-article--video highlighted">
                     <div class="info-article__media">
-                        <iframe class="info-article__media--youtube" src="https://www.youtube.com/embed/7-zvaghwb6M" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>
+                        <iframe class="info-article__media--youtube" src="https://www.youtube.com/embed/7-zvaghwb6M" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture; fullscreen"></iframe>
                     </div>
                 </div>
                 <div class="info-article info-article--video highlighted">
                     <div class="info-article__media">
-                        <iframe class="info-article__media--youtube" src="https://www.youtube.com/embed/OEgASTpkwmw" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>
+                        <iframe class="info-article__media--youtube" src="https://www.youtube.com/embed/OEgASTpkwmw" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; fullscreen" ></iframe>
                     </div>
                 </div>
                 <div class="info-article info-article--text">
@@ -114,13 +114,13 @@
             <div class="container">
                 <h2>Wichtige Portale für dein Studium</h2>
                 <div class="links">
-                    <div class="link gallery-cell"><a href=""><img class="link__thumbnail" src="assets/images/obs_standart.png" title="Online Belegsystem OBS" /></a></div>
-                    <div class="link gallery-cell"><a href=""><img class="link__thumbnail" src="assets/images/qis_standart.png" title="Onlinesystem QIS" /></a></div>
-                    <div class="link gallery-cell"><a href="https://lernen.h-da.de"><img class="link__thumbnail" src="assets/images/moodleLogo.png" title="Moodle" /></a></div>
-                    <div class="link gallery-cell"><a href="https://webmail.stud.h-da.de"><img class="link__thumbnail" src="assets/images/roundcube.png" title="Discord Channel des Fachbereichs Informatik" /></a></div>
-                    <div class="link gallery-cell"><a href="https://code.fbi.h-da.de"><img class="link__thumbnail" src="assets/images/GitLab_Logo.svg.png" title="GitLab der Hochschule Darmstadt" /></a></div>
-                    <div class="link gallery-cell"><a href="https://fbihome.de"><img class="link__thumbnail" src="assets/images/fbiLogo.png" title="Fachbereich Informatik" /></a></div>
-                    <div class="link gallery-cell"><a href="https://discord.com/invite/22w3knc"><img class="link__thumbnail" src="assets/images/dc.png" title="Discord Channel des Fachbereichs Informatik" /></a></div>
+                    <div class="link gallery-cell"><a href=""><img class="link__thumbnail" src="assets/images/obs_standart.png" alt="assets/images/obs_standart.png"title="Online Belegsystem OBS" /></a></div>
+                    <div class="link gallery-cell"><a href=""><img class="link__thumbnail" src="assets/images/qis_standart.png" alt="assets/images/qis_standart.png" title="Onlinesystem QIS" /></a></div>
+                    <div class="link gallery-cell"><a href="https://lernen.h-da.de"><img class="link__thumbnail" src="assets/images/moodleLogo.png" alt="assets/images/moodleLogo.png" title="Moodle" /></a></div>
+                    <div class="link gallery-cell"><a href="https://webmail.stud.h-da.de"><img class="link__thumbnail" src="assets/images/roundcube.png" alt="assets/images/roundcube.png" title="Discord Channel des Fachbereichs Informatik" /></a></div>
+                    <div class="link gallery-cell"><a href="https://code.fbi.h-da.de"><img class="link__thumbnail" src="assets/images/GitLab_Logo.svg.png" alt="assets/images/GitLab_Logo.svg.png" title="GitLab der Hochschule Darmstadt" /></a></div>
+                    <div class="link gallery-cell"><a href="https://fbihome.de"><img class="link__thumbnail" src="assets/images/fbiLogo.png" alt="assets/images/fbiLogo.png" title="Fachbereich Informatik" /></a></div>
+                    <div class="link gallery-cell"><a href="https://discord.com/invite/22w3knc"><img class="link__thumbnail" src="assets/images/dc.png" alt="assets/images/dc.png" title="Discord Channel des Fachbereichs Informatik" /></a></div>
                 </div>
             </div>
         </section>