.grid-background{position:relative;background:#f5f5f5;background-size:50px 50px;background-image:linear-gradient(to right,rgba(0,0,0,.1) 1px,transparent 1px),linear-gradient(to bottom,rgba(0,0,0,.1) 1px,transparent 1px);animation:moveGrid 15s linear infinite}@keyframes moveGrid{0%{background-position:0 0}to{background-position:50px 50px}}body{margin:0;padding:0}