.ig-b- img { visibility: hidden; }
.ig-b-:hover { background-position: 0 -60px; } .ig-b-:active { background-position: 0 -120px; }
<a href="http://instagram.com/guapatus?ref=badge" class="ig-b- ig-b-48"><img src="//badges.instagram.com/static/images/ig-badge-48.png" alt="Instagram" /></a>