@keyframes scan{0%{background-position:0 0}to{background-position:0 100%}}.dark body:before{animation:scan 10s linear infinite;background:repeating-linear-gradient(0deg,rgba(0,255,0,.03),transparent 1px,transparent 2px,rgba(0,255,0,.03) 3px);content:"";height:100%;left:0;pointer-events:none;position:fixed;top:0;width:100%;z-index:9999}