.runner{place-content:center;place-items:center;display:flex;position:relative;overflow:hidden}.runner:before{content:"";background-image:linear-gradient(#00b7ff,#ff30ff);width:100px;height:200%;transition:all .2s linear;animation:5s linear infinite rotBGimg;position:absolute}@keyframes rotBGimg{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.runner:after{content:"";position:absolute;inset:10px}