[YTEmbed] Make it look better on mobile

yt-embed/yt-embed.css

@@ -1,6 +1,7 @@
 .yt-embed {
-    width: 100%;
-    height: 100%;
+    width: 98%;
+    height: 98%;
+    padding: 1%;
     display: flex;
     justify-content: center;
     align-items: center;