.matrix-bg{position:absolute;top:0;left:0;width:100%;height:100%;overflow:hidden;background:linear-gradient(180deg,rgba(0,0,0,.8) 0,rgba(0,0,0,.2))}.matrix-bg:before{content:"";position:absolute;top:-50%;left:-50%;width:200%;height:200%;background-image:linear-gradient(rgba(0,255,0,.1) 1px,transparent 0),linear-gradient(90deg,rgba(0,255,0,.1) 1px,transparent 0);background-size:20px 20px;animation:matrix 20s linear infinite}@keyframes matrix{0%{transform:translateY(0)}to{transform:translateY(50%)}}.relative,footer,header{position:relative}footer,header{z-index:20}main{position:relative;z-index:10}