html {
    background: #2e1e40;
    background-attachment: fixed;
    color: #fff;
  }
  
  body {
    color: rgba(255, 255, 255, 0.8);
    font: normal 15pt Arial;
    margin: 0;
    padding-top: 5rem;
    text-align: center;
  }
  
  h1 {
    font-weight: 300;
    margin: 0;
    margin-bottom: 3rem;
  }

  
  .calculator {
    font-size: 28px;
    margin: 0 auto;
    width: 12em;
    
    }
  
  
  /* Calculator after dividing by zero */
  .broken {
    animation: broken 2s;
    transform: translate3d(0,-2000px,0);
    opacity: 0;
  }
  
  .viewer {
    color: #cc567a;
    float: left;
    line-height: 3em;
    text-align: right;
    text-overflow: ellipsis;
    overflow: hidden;
    height: 3em;
    width: 8.5em;
  }
  
  button {
    border: 0;
    background: rgba(0, 0, 0, 0.2);
    color: rgba(255, 255, 255, 0.8);
    border-radius: 5px;
    cursor: pointer;
    float: left;
    font: inherit;
    width: 2em;
    height: 2em;
    transition: all 0.5s;
    margin: 0.5em;
    
    
    }

    button:hover{
        background: rgba(0, 0, 0, 0.4);
    }