优惠券内陷样式（无兼容性问题）

radial-gradient 在微信小程序ios中会有兼容性问题

效果如图：

// html

<view class="cro">
  <view class="cro_left_top"></view>
  <view class="cro_right_top"></view>
  <view class="cro_left_bottom"></view>
  <view class="cro_right_bottom"></view>
</view>


// css
.cro {
  width: 600rpx;
  height: 300rpx;
  background: #0c8;
  position: relative;
  margin: 200rpx auto;
}

.cro_left_top, .cro_right_top, .cro_left_bottom, .cro_right_bottom {
  position: absolute;
  width: 40rpx;
  height: 40rpx;
  border: 1px solid #fff;
  z-index: 1;
  background: #fff;
}

.cro_left_top {
  top: -1px;
  left: -1px;
  border-radius: 0px 0px 40rpx 0px;
  border-bottom: 1px solid #0c8;
  border-right: 1px solid #0c8;
}

.cro_right_top {
  top: -1px;
  right: -1px;
  border-radius: 0px 0px 0px 40rpx;
  border-bottom: 1px solid #0c8;
  border-left: 1px solid #0c8;
}

.cro_left_bottom {
  left: -1px;
  bottom: -1px;
  border-radius: 0px 40rpx 0px 0px;
  border-top: 1px solid #0c8;
  border-right: 1px solid #0c8;
}

.cro_right_bottom {
  right: -1px;
  bottom: -1px;
  border-radius: 40rpx 0px 0px 0px;
  border-top: 1px solid #0c8;
  border-left: 1px solid #0c8;
}

本文地址：https://blog.csdn.net/qq_37034928/article/details/108863835