In case the above advice doesn't work out for you, here's the way the lovely Vio taught me to use that code; crudely quoted below.
*div="float: right; border-radius: 8px; width: 32px; height: 32px; box-shadow: 0 0 2px 1px #a5d683;"**div="opacity: 0.2; width: 32px; height: 32px; overflow: hidden;"* *div="position: absolute; top: -134px; left: 0;"* *MEDIA=youtube*yQgAr6b59q4*/MEDIA**/div* */div* */div*
Replace the stars with proper brackets to make it work.
Just a note, this part "*MEDIA=youtube*yQgAr6b59q4*/MEDIA*" in order to like...get it to be the song you want, you take like that random part at the end of the youtube link, not the whole thing. You know the random part with random ass letters