3D Hover Flip Sign Up Button

<div class="scene">
  <div class="cube">
    <span class="side top">Sign Up</span>
    <span class="side front">Sign Up</span>
  </div>
  <style>
    .scene {
      width: 10em;
      justify-content: center;
      align-items: center;
    }
  
    .cube {
      color: #ccc;
      cursor: pointer;
      font-family: 'Roboto', sans-serif;
      transition: all 0.85s cubic-bezier(.17, .67, .14, .93);
      transform-style: preserve-3d;
      transform-origin: 100% 50%;
      width: 10em;
      height: 4em;
    }
  
    .cube:hover {
      transform: rotateX(-90deg);
    }
  
    .side {
      box-sizing: border-box;
      position: absolute;
      display: inline-block;
      height: 4em;
      width: 10em;
      text-align: center;
      text-transform: uppercase;
      padding-top: calc(1.5em - 4px);
      font-weight: bold;
    }
  
    .top {
      background: #2563eb;
      color: #fff;
      transform: rotateX(90deg) translate3d(0, 0, 2em);
      border: 1px solid #000;
    }
  
    .front {
      background: #000;
      color: #fff;
      border: 1px solid #000;
      transform: translate3d(0, 0, 2em);
    }
  </style>
</div>