.cols-lines{--gap:2rem;--line-offset:calc(var(--gap)/2);--line-thickness:2px;--line-color:#603f99;gap:var(--gap)}section:after,section:before{background-color:var(--line-color);content:"";position:absolute;z-index:1}section:before{block-size:100vh;inline-size:var(--line-thickness);inset-inline-start:calc(var(--line-offset)*-1)}