.bg{animation:slide 3s ease-in-out infinite alternate;background-image:linear-gradient(-60deg,#6c3 50%,#09f 0);bottom:0;left:-50%;opacity:.8;position:absolute;right:-50%;top:0;z-index:0}.bg2{animation-direction:alternate-reverse;animation-duration:4s}.bg3{animation-duration:5s}@keyframes slide{0%{transform:translateX(-25%)}to{transform:translateX(25%)}}