模糊内容的遮罩层

1. markBlur要加给遮住的内容，不要加给遮罩层
2. 如果要想遮罩层的内容显示，除了给高层级之外，还要写在有markBlur类的内容的前面。

.markBlur {
  filter: blur(6px);
  user-select: none;
}
.correction-process-mark {
  display: flex;
  flex-direction: column;
  align-items: center;
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 724px;
  background-color: rgba(255, 255, 255, 0.5);
  z-index: 3;
}

https://blog.csdn.net/github_35631540/article/details/105436002