宽高 ​

wh-4.04

width:4.04rpx;height:4.04rpx;

wh-4.04rem

width:4.04rem;height:4.04rem;

wh-4

width:4rpx;height:4rpx;

wh-4vh

width:4vh;height:4vh;

wh-21vw

width:21vw;height:21vw;

wh-21rem

width:21rem;height:21rem;

wh-21px

width:21px;height:21px;

wh-21rpx

width:21rpx;height:21rpx;

wh-40%

width:40%;height:40%;