popup.html

<style>
a {
	background: 0 0;
    border: none;
    border-radius: 2px;
    color: #D84141;
    position: relative;
    height: 36px;
    margin: 0;
    min-width: 64px;
    padding: 0 16px;
    display: inline-block;
    font-family: "Roboto","Helvetica","Arial",sans-serif;
    font-size: 14px;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0;
    overflow: hidden;
    will-change: box-shadow;
    transition: box-shadow .2s cubic-bezier(.4,0,1,1),background-color .2s cubic-bezier(.4,0,.2,1),color .2s cubic-bezier(.4,0,.2,1);
    outline: none;
    cursor: pointer;
    text-decoration: none;
    text-align: center;
    line-height: 36px;
    vertical-align: middle;
    width:120px;
}	
a:hover{
	background-color: rgba(158,158,158,.2);
}
</style>
<a href="#" id="btnUpdate">Disable</a>
<a href="#" id="btnSettings">Options</a>
<a href="#" id="btnPlayHlS">Play Embedded</a>
<a href="https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=RRFWQRA2Z4RJC" target="_blank">Donate</a>
<script type="text/javascript" src="global.js"></script>
<script type="text/javascript" src="popup.js"></script>