小程序 checkbox 样式自定义，圆形，对钩变圆点

<checkbox class="custom-checkbox"></checkbox>

.custom-checkbox .wx-checkbox-input{
  border-radius: 50%;
  border: 2rpx solid #FC703E;
}
.custom-checkbox .wx-checkbox-input.wx-checkbox-input-checked {
  background: #FC703E;
}
.custom-checkbox .wx-checkbox-input.wx-checkbox-input-checked::before {
  display: none;
}
.custom-checkbox .wx-checkbox-input.wx-checkbox-input-checked::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 26rpx;
  height: 26rpx;
  border: 6rpx solid #fff;
  border-radius: 50%;
  transform: translate(-50%,-50%);
}