.columns {
    float: left;
    width: 100%;
    padding: 8px;
  }
  
  .price {
    list-style-type: none;
    border: 1px solid #a0a0a0;
    margin: 0;
    padding: 0;
    -webkit-transition: 0.3s;
    transition: 0.3s;
  }
  
  .price:hover {
    box-shadow: 0 8px 12px 0 rgba(0,0,0,0.2)
  }
  
  .price .header {
    background-color: #F9B81F;
    color: #000;
    font-size: 25px;
  }
  
  .price li {
    border-bottom: 1px solid #eee;
    padding: 20px;
    text-align: center;
  }
  
  .price .grey {
    background-color: #eee;
    font-size: 20px;
  }
  
  .button {
    background-color: #F9B81F;
    border: none;
    color: white;
    padding: 10px 25px;
    text-align: center;
    text-decoration: none;
    font-size: 18px;
  }
  
  @media only screen and (max-width: 600px) {
    .columns {
      width: 100%;
    }
  }