Bottom area are left for youtube default controller, play and watch on youtube.
<html>
<head>
<script type="text/javascript">
// Change the value of this string to your URL
var clickTag = "https://www.youtube.com/watch?v=vhMZSAMBSLE";
</script>
</head>
<body style="margin: 0px;">
<a href="javascript:window.open(window.clickTag)" style="position:relative; display:inline-block;z-index: 2;">
<div style="position:absolute;height: 224px;width: 300px;z-index:1;right:0px;"></div>
<iframe width="300" height="250" src="https://www.youtube.com/embed/vhMZSAMBSLE?autoplay=1&rel=0&loop=1&mute=1&playsinline=1" frameborder="0" allow="autoplay; encrypted-media" allowfullscreen=""></iframe>
</a>
</body>
</html>