diff --git a/src/assets/i18n/demo/demo-de.html b/src/assets/i18n/demo/demo-de.html
index 81062cdb59227f6a28d736be505bd956645a5040..d4ea9e9b0b30308f7ccfee182dc9cab879ec2b47 100644
--- a/src/assets/i18n/demo/demo-de.html
+++ b/src/assets/i18n/demo/demo-de.html
@@ -2,7 +2,6 @@
   <div class="videoWrapper">
     <iframe tabindex="0"
             width="560" height="315"
-            [ngClass]="{'mobileFrame': deviceType === 'mobile', 'desktopFrame': deviceType === 'desktop'}"
             src="https://www.youtube.com/embed/0mxQxPmU9Aw?autoplay=0" frameborder="0"
             allowfullscreen
     ></iframe>
diff --git a/src/assets/i18n/demo/demo.scss b/src/assets/i18n/demo/demo.scss
index 747f264e1c991f7e07aa8fb9bcfb542d1ba077c9..1cc66d9c186ba39b0e19e3b9ed91ed9af12eaf6d 100644
--- a/src/assets/i18n/demo/demo.scss
+++ b/src/assets/i18n/demo/demo.scss
@@ -4,3 +4,21 @@ p {
   -webkit-hyphens: auto;
   hyphens: auto;
 }
+
+iframe {
+  width: 100%;
+}
+
+.videoWrapper {
+  position: relative;
+  padding-bottom: 56.25%; /* 16:9 */
+  padding-top: 25px;
+  height: 0;
+}
+.videoWrapper iframe {
+  position: absolute;
+  top: 0;
+  left: 0;
+  width: 100%;
+  height: 100%;
+}