vs code 背景图

 body::before{
    content: ‘‘;
    position: absolute;
    left: 0;
    top:0;
    right: 0;
    bottom: 0;
    background-image: url("file:///Users/eleme/Desktop/assets/bg-img.jpg");
    background-size: 100% 100%;
    pointer-events: none;
    opacity: 0.16;
    z-index: 999;
}
.slider-mouseover::before{
  content: ‘‘;
  position: absolute;
  left: 0;
  top:0;
  right: 0;
  bottom: 0;
  background-image: url("file:///Users/eleme/Desktop/assets/bad.gif");
  background-repeat: no-repeat;
  background-size: contain;
  background-position: bottom;
  pointer-events: none;
  opacity: 0.66;
  z-index: 999;
}