body, html
  {
    background-color: #eee;
    color: #444;
    font-family: system-ui, Helvetica, Arial, sans-serif;
    letter-spacing: 0.05em;
    padding: 1em;
  } h1, h2, h3, h4, h5, li
  {
    line-height: 1.5em;
  }
  h2
  {
    width: 100%;
    border-bottom: 1px solid #aaa;
    padding-bottom: 0.25em;
  }
  li
  {
    list-style-type: square;
    color: #777;
  }
  #button
  {
    display: none;
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    padding: 1em 1em 1em 2.5em;
    background: #444;
    box-shadow: 0 0 0.8em #444;
  }
  #button a
  {
    text-decoration: none;
    font-weight: bold;
    font-size: .9em;
    letter-spacing: .1em;
    line-height: 1em;
    color: #eee;
    display: inline-block;
    border: 2px solid #eee;
    padding: 1em 2em 1em 2em;
    margin: 1em;
    transition: 0.1s background-color linear, 0.1s color linear
  }
  #button a:hover
  {
    color: #444;
    background-color: #eee;
  }
  #message
  {
    padding-bottom: 5em;
  }
  #version_div {
    border-bottom: 1px solid #999;
    display: inline-block;
    position: relative;
    background-color: #ddd;
  }
  #version_div::after {
    content: ' \2228';
    font-size: 0.8em;
    line-height: 0.8em;
    height: 0.8em;
    color: #999;
    pointer-events: none;
    position: absolute;
    right: 0.2em;
    top: 0.2em;
  }
  #version {
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
    background-color: transparent;
    border: none;
    font-family: inherit;
    font-size: inherit;
    font-weight: inherit;
    color: inherit;
    line-height: 1em;
    z-index: 1;
    outline: none;
    padding-right: 1em;
    padding-left: 0.2em;
  }
  #channel {
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
    background-color: transparent;
    border: none;
    font-family: inherit;
    font-size: inherit;
    font-weight: inherit;
    color: inherit;
    line-height: 1.2em;
    padding:  0 0.1em;
    margin:  0 0.15em;
    min-width: 2em;
    display: inline-block;
  }
  #device {
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
    background-color: transparent;
    border: none;
    font-family: inherit;
    font-size: inherit;
    font-weight: inherit;
    color: inherit;
    line-height: 1.2em;
    padding:  0 0.1em;
    margin:  0 0.15em;
    min-width: 2em;
    display: inline-block;
  }