Update index.html

Author: kimsanghoon1

_layouts/index.html

@@ -15,7 +15,7 @@
 </script>
 <div class="md-modal md-effect-12 md-show">
     <div class="md-content">
-	<button class="md-close">Close</button>
+	<button class="md-close"  style="float: right">Close</button>
         <iframe width="630" height="410" src="https://www.youtube.com/embed/4J8mViMo8lE" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>
     </div>
 </div>