*{
    margin: 0;
    padding: 0;
    text-decoration: none;
    list-style: none;
    font-family: "Open Sans",sans-serif;
  }
  
  body{
    display: flex;
    height: 100vh;
    background-color: #111;
    align-items: center;
    justify-content: center;
    text-align: center;
  }
  
  .menu a{
    display: inline-block;
    margin: 30px;
    padding: 12px 60px;
    color: #f1f1f1;
    text-transform: uppercase;
    font-size: 30px;
    font-weight: 600;
    transition: .3s linear;
    position: relative;
  }
  
  .menu a:hover{
    color: #111;
  }
  
  .menu a::before,
  .menu a::after{
    content: "";
    position: absolute;
    width: 100%;
    height: 0%;
    left: 0;
    box-sizing: border-box;
    z-index: -1;
  }
  
  .menu a::before{
    bottom: 0;
    border-left: 1px solid #f1f1f1;
    border-right: 1px solid #f1f1f1;
    transition: .3s linear;
  }
  
  .menu a::after{
    top: 0;
    background-color: #f1f1f1;
    transition: .3s linear .3s;
  }
  
  .menu a:hover::before,
  .menu a:hover::after{
    height: 100%;
  }