html{position:fixed;background:#000;width:100vw;height:100vh}body{margin:0;padding:0;width:100vw;height:100vh;overflow:hidden}.game-background,#background{background-size:contain;background:url(img/backgrounds/pattern.png) repeat-x;content:"";position:absolute;z-index:-1;width:100%;height:100%;left:0;top:0;margin:0;padding:0}