.comp-clean{background:url(img/comp-cleaning.jpg) center center no-repeat;-webkit-background-size:cover;-moz-background-size:cover;-o-background-size:cover;background-size:cover}.comp-xray{background:url(img/comp-xray.jpg) center center no-repeat;-webkit-background-size:cover;-moz-background-size:cover;-o-background-size:cover;background-size:cover}.comp-exam{background:url(img/comp-exam.jpg) center center no-repeat;-webkit-background-size:cover;-moz-background-size:cover;-o-background-size:cover;background-size:cover}