.bg{animation:slide 5s ease-in-out infinite alternate;background-image:linear-gradient(-60deg,#0ff 45%,#00f 48%);bottom:0;left:-70%;opacity:.1;position:fixed;right:-70%;top:0;z-index:-1}.bg2{animation-direction:alternate-reverse;animation-duration:5s;opacity:.1}.bg3{animation-duration:7s;opacity:.2}.bg4{animation-direction:alternate-reverse;animation-duration:7s;opacity:.2}@keyframes slide{0%{transform:translate(-25%)}to{transform:translate(25%)}}