.splash {
  width: 80%;
  height: 50%;
  margin: auto;
  position: absolute;
  top: 100px;
  left: 0;
  bottom: 0;
  right: 0;
  text-align: center;
}
.splash_head {
  color: #fff;
  padding: 0.8em 0.5em 1em;
  line-height: 1.5em;
  margin: 0.2em 0 0.5em;
  text-shadow: 0 4px 3px rgb(0 0 0 / 40%), 0 8px 13px rgb(0 0 0 / 10%), 0 18px 23px rgb(0 0 0 / 10%);
}
.bg_video{
  position: fixed;  
  right: 0;
  bottom: 0;
  min-width: 100%;  
  min-height: 100%;  
  height: auto;  
  width: auto;  
  /*加滤镜*/
  filter: blur(2px);
  /*-webkit-filter: grayscale(100%);*/  
  /*filter:grayscale(100%); //背景灰度设置*/  
  z-index:-11
}