Merge branch 'MLAB-507-fix' into 'testing'

Update videoconference.html

See merge request !111

videoconference.html

@@ -42,7 +42,7 @@
             <div
                 class="row flex-row justify-content-start align-items-start align-content-stretch align-self-stretch flex-wrap align-items-lg-start">
                 <div
-                    class="col-md-6 text-center d-flex flex-column justify-content-center align-items-md-center videoconference_jitsi">
+                    class="offset-md-3 col-md-6 text-center d-flex flex-column justify-content-center align-items-md-center videoconference_jitsi">
                     <h2 class="text-center heading"><strong>Jitsi</strong><br></h2>
                     <p class="text-center"><strong>Für alle Nutzer des Portals</strong><br><br></p>
                     <p class="text-left">Videokonferenzen direkt im Browser<br>OpenSource System<br></p>