html { 
    widht: 100%;
    height: 100%; }

body {
  position: relative;
  font: 36px Arial, sans-serif;
  min-height: 100%;
  margin: 0;
  padding: 0;
  transform-style: preseve-3d;
}

footer { position: absolute; bottom:0; left:0; right:0; text-align:center;}


// img { display:block; margin-top:50%; margin-left:auto; margin-right:auto; }

img { position:absolute; top:50%; left:50%; transform: translate(-50%,-50%); }