Template:UltimateGuitar/styles.css

.ultimateguitar .mw-ui-button::before { background: url(https://upload.wikimedia.org/wikipedia/commons/thumb/b/bf/Ultimate-Guitar.com_logo.png/30px-Ultimate-Guitar.com_logo.png); content: ''; display: inline-block; height: 30px; margin-right: 6px; width: 30px; vertical-align: -10px; }