You can add your own stylesheet in the <HEAD> of the template. I don't recommend this as it is impossible to maintain, but if you don't know where your styles are coming from it's going to be the easiest for you.
<HEAD>
... other stuff here ...
<STYLE type="text/css">
.cf_videoshare_referral {
display: none !important;
}
</STYLE>
</HEAD>
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