.low-box #topRuler{width:100%;height:30px;background:#2196f3;color:#fff;padding:0 0;padding-left:30px}.low-box #leftRuler{width:30px}#LowCode{position:relative;flex:1}#LowCode .target{min-width:200px;min-height:200px;background:#2196f3;position:absolute}