body {
    margin: auto;
    height: 100vh;
    background: #fff;
    color: #000;
}

.wrapper {
    text-align: center;
    position: absolute;
    top: 50%;
    -ms-transform: translateY(-50%);
    transform: translateY(-50%);
    width: 100%;
}

.wrapper > a {
   text-decoration: none;
   font-family: Arial,sans-serif;
   font-weight: 600;
   font-size: 1.5em;
   line-height: 1.3em;
}

.wrapper img {
    display: block;
    width: 70vw;
    margin: 0 auto 0 auto;
}

/* CSS */
.button-50 {
    appearance: button;
    background-color: #000;
    background-image: none;
    border: 1px solid #000;
    border-radius: 4px;
    box-shadow: #fff 4px 4px 0 0,#000 4px 4px 0 1px;
    box-sizing: border-box;
    color: #fff;
    cursor: pointer;
    display: inline-block;
    
    line-height: 20px;
    margin: 0 5px 10px 0;
    overflow: visible;
    padding: 12px 40px;
    text-align: center;
    text-transform: none;
    touch-action: manipulation;
    user-select: none;
    -webkit-user-select: none;
    vertical-align: middle;
    white-space: nowrap;
  }
  
  .button-50:focus {
    text-decoration: none;
  }
  
  .button-50:hover {
    text-decoration: none;
  }
  
  .button-50:active {
    box-shadow: rgba(0, 0, 0, .125) 0 3px 5px inset;
    outline: 0;
  }
  
  .button-50:not([disabled]):active {
    box-shadow: #fff 2px 2px 0 0, #000 2px 2px 0 1px;
    transform: translate(2px, 2px);
  }
  
  @media (min-width: 768px) {
    .button-50 {
      padding: 12px 50px;
    }
  }