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SCSS
#slider {
  img {
    position: absolute;
    top: 0;
    left: 0;
    width: 300px;
    height: 200px;
    
    &:target {
      transition: all .5s ease-in-out;
    }
    
    &:not(:target), 
    &:target ~ img#slide-4  {
      position: relative;
      opacity: 0;
    }

    // set initially visible
    &#slide-4 {
      position: absolute;
      opacity: 1;
     }
  }
}