<!--HTML-->
  <div class="exhibit-content">
    <h1>Animate other elements
    <button>BUTTON 1
    <button>BUTTON 2
    <button>BUTTON 3
  </div>

  /* CSS */
  .exhibit-content {
    pointer-events: none;
  }
  .exhibit-content button {
    pointer-events: auto;
    transition: background-color 0.3s ease-out;
  }
  .exhibit-content:hover > button:not(:hover) {
    color: white;
    background-color: black;
  }
          

  <!--HTML-->
  <div class="exhibit-content">
    <h1>Slide in animations</h1>
    <button id="btn-left">LEFT</button>
    <button id="btn-right">RIGHT</button>
    <button id="btn-right">RIGHT</button>
    <button id="btn-bottom">BOTTOM</button>
  </div>
          

  /* CSS */
  button {
    position: relative;
    overflow: hidden;
    z-index: 1;
  }
  
  button:hover {
    color: white;
  }
  
  button::before {
    z-index: -1;
    position: absolute;
    content: "";
    height: 100%;
    width: 100%;
    background-color: black;
    transition: all 0.4s ease-out;
  }
  
  #btn-left::before {
    top: 0;
    left: -100%;
  }
  #btn-left:hover::before {
    left: 0;
  }
  
  #btn-top::before {
    top: -100%;
    left: 0;
  }
  #btn-top:hover::before {
    top: 0;
  }
  
  #btn-right::before {
    top: 0;
    left: 100%;
  }
  #btn-right:hover::before {
    left: 0;
  }
  
  #btn-bottom::before {
    top: 100%;
    left: 0;
  }
  #btn-bottom:hover::before {
    top: 0;
  }