Artist Hover CSS

I can't remember where I found the CSS but if you know where, please let me know!

.user-css .artist-credits {
background: transparent;
font-size: 0px;
line-height: 0px;
padding: 10px;
margin: auto;
content:url(https://www.worldanvil.com/uploads/images/838028c34d1bd01d4f908fa3e6582f6b.png)
}

.user-css .artist-credits:hover {
content: normal;
font-size: 17px;
line-height: 20px;
transition: all 0.3s;
padding: 20px;
margin: auto;
color: #808080;
}