.arrow{display:inline-block;width:0;height:0}.arrow.up{border-left:4px solid transparent;border-right:4px solid transparent;border-bottom:6px solid #ccc}.arrow.down{border-left:4px solid transparent;border-right:4px solid transparent;border-top:6px solid #ccc}.arrow.right{border-top:4px solid transparent;border-bottom:4px solid transparent;border-left:6px solid #ccc}.arrow.left{border-top:4px solid transparent;border-bottom:4px solid transparent;border-right:6px solid #ccc}