Changed default embedding to scale with the site at a fixed aspect ratio

Chia

templates/macros.html

@@ -226,7 +226,7 @@ $(function() {
 	<span>Einbetten</span>
 </a>
 <script>
-{% set embedcode = '<iframe width="700" height="394" src="'+url_for('embed', course=course, id=lectureid, _external=True)+'" frameborder="0" allowfullscreen="true"></iframe>' %}
+{% set embedcode = '<div style="position:relative;padding-top:56.25%;"><iframe style="position:absolute;top:0;left:0;width:100%;height:100%;overflow: hidden;" src="'+url_for('embed', course=course, id=lectureid, _external=True)+'" frameborder="0" allowfullscreen="true" scrolling="no"></iframe></div>' %}
 $('#embedcodebtn').popover(
 		{
 			html:true,