make iframe responsive

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>

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%;
+}