section {
    max-width: 300px;
    margin: 3em auto;
  }
  
  a.btn_10 {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
    height: 50px;
    box-sizing: border-box;
    background: #fff;
    position: relative;
  }
  
  a.btn_10 span {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
    height: 50px;
    background: #fff;
    box-sizing: border-box;
    color: #333;
    font-size: 14px;
    letter-spacing: 0.1em;
    text-decoration: none;
    box-shadow: 0px 5px 12px #CAD4E2, -6px -6px 12px #FFF;
    border-radius: 10px;
    position: absolute;
    top: -5px;
    left: 0;
    transition-duration: 0.2s;
  }
  
  /*
  a.btn_10:hover span {
    left: 0;
    top: 0;
    box-shadow: 0 0 4px #CAD4E2, -2px -2px 4px #FFF;
  }
  */