Add video-container class

Author: PoojaB26

src/css/custom.css

@@ -111,4 +111,20 @@ div.alert {
 
 .arcade-container {
 margin-bottom: 24px;
+}
+
+.video-container {
+  position: relative;
+  width: 100%;
+  padding-bottom: 56.25%; /* 16:9 aspect ratio */
+  height: 0;
+  overflow: hidden;
+}
+
+.video-container iframe {
+  position: absolute;
+  top: 0;
+  left: 0;
+  width: 100%;
+  height: 100%;
 }