html, body, .logo{position:relative;width:100%;height:100%;margin:0;padding:0;}

body{background:#fff;}

.logo{position:relative;}

.logo img{
display:block;
position:absolute;
max-width:90%;
height:auto;
left:50%;
top:50%;
-ms-transform: translate(-50%,-50%);
-webkit-transform: translate(-50%,-50%);
transform: translate(-50%,-50%);}