fix(www): add styles for video (#4851)

Author: shreykul

projects/www/src/styles.scss

@@ -171,3 +171,24 @@ analog-markdown-route > div {
   overflow: hidden;
   width: 100%;
 }
+
+.video-container {
+  width: 100%;
+  max-width: 750px;
+  justify-content: center;
+  margin: 1rem auto;
+}
+
+.video-responsive-wrapper {
+  position: relative;
+  padding-bottom: 56.25%; /* 16:9 */
+  height: 0;
+
+  > iframe {
+    position: absolute;
+    top: 0;
+    left: 0;
+    width: 100%;
+    height: 100%;
+  }
+}