实现效果

image.png

代码

  1. &_bg {
  2.   position: absolute;
  3.   height: 450rpx;
  4.   width: 160%;
  5.   top: 50%; 
  6.   left: 50%; 
  7.   transform: translate(-50%, -50%);
  8.   border-radius: 0 0 70% 70%;
  9.   background-color: $uni-color-error;
  10. }