.wall:before{content:"";position:absolute;inset:0;pointer-events:none;border:2px solid black}.dark .wall:before{border-color:rgb(148 163 184)}.wall.no-border-top:before{border-top-color:transparent}.wall.no-border-bottom:before{border-bottom-color:transparent}.wall.no-border-left:before{border-left-color:transparent}.wall.no-border-right:before{border-right-color:transparent}