点線の長方形

<view class="demo"></view>
.demo{
    
    
		width: 600rpx;
		height: 300rpx;
		border: 2rpx dashed transparent;
		background: linear-gradient(white,white) padding-box,repeating-linear-gradient(-45deg,red 0, red 25rpx,white 0,white 45rpx);
	}