* {
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
    box-sizing: border-box;
  }

  body {
    margin: 0 auto;
    font-family: courier, monospace, sans-serif;
    line-height: 1.3125;
    color: #333;
  }

  header {
    padding: 0.5em;
    background-color: #fff;
    text-align: center;
  }

  footer {
    font-size: 0.875em;
    text-align: center;
    color: #666;
  }

  h1,
  label[for="input"],
  label[for="output"] {
    margin: 0;
    font-size: 1em;
    font-weight: 700;
    letter-spacing: 0.0625em;
    text-transform: uppercase;
  }

  label[for="input"],
  label[for="output"] {
    font-weight: 400;
  }

  .source-link {
    font-size: 0.875em;
  }

  .row:before,
  .row:after {
    content: " ";
    display: table;
  }

  .row:after {
    clear: both;
  }

  .row {
    *zoom: 1;
  }

  .col,
  .form-group {
    padding: 0 0.5em;
  }

  @media (min-width: 36em) {
    .col {
      float: left;
      width: 50%;
    }
  }

  textarea {
    width: 100%;
    height: 36em;
    margin: 0;
    padding: 0.5em;
    overflow: auto;
    border: 1px solid;
    background-color: #fff;
    font-family: inherit;
    font-size: inherit;
    line-height: inherit;
    color: inherit;
  }

  #input {
    background-color: #333;
    color: #fff;
    border: none;
  }