<a class="resim"  href="#"><img src="adres" title="" alt=""/></a>

a.resim img { background-image: url("resimyolu.jpg"); background-repeat: no-repeat; background-size: cover; width: 285px; height: 95px; transition: all .5s; border-radius: 30px; } a.resim img:hover { border-radius: 0px; opacity: .5; }