.stars,.twinkling{z-index:0;background:0 0;width:200%;height:200%;position:absolute;top:0;left:0}.stars{opacity:.7;background:url(/stars.png);animation:100s linear infinite moveStars}.twinkling{opacity:.4;background:url(/twinkling.png);animation:150s linear infinite moveTwinkling}@keyframes moveStars{0%{transform:translate(0)}to{transform:translate(-50%,-50%)}}@keyframes moveTwinkling{0%{transform:translate(0)}to{transform:translate(50%,50%)}}