.rows{display:flex;flex-direction:column}.row{display:flex;flex-direction:row;flex-grow:1}.leaf{flex-grow:1;width:calc(100vw / 3);padding:5px;font-size:.8em}.header{font-size:1.3em;background-color:#fff;position:sticky;top:0;border-bottom:solid 1.5px lightslategrey}.header *{border:none}.ss:first-child{border-top:none}.ss{border-top:solid 1.5px lightslategrey}.so{border-bottom:solid 1px lightslategrey;border-left:solid 1px lightslategrey}.sm{border-bottom:solid .5px lightslategrey;border-left:solid .5px lightslategrey}.so:last-child{border-bottom:none}.sm:last-child{border-bottom:none}