.float{ position:fixed; bottom:60px; right:60px; font-size:16px; z-index:100; } 
img { width: 260px; height: 260px; margin-top: -130px; margin-left: -130px; left: 50%; top: 50%; position: absolute; }

@media only screen and (max-width: 600px) {
.float{ position:fixed; bottom:60px; right:60px; font-size:24px; z-index:100; } 
}