html, body {
  height: 100%;
}

body {
  font: normal 20px/24px "Helvetica Neue", Helvetica, Arial, sans-serif;
  color: #666;
  margin: 0;
}

.wrapper {
    height: 100%;
}

.band {
  width: 400px;
  height: 100%;
  margin: 0 auto;
  text-align: center;
  padding: 20px;
  border-left: 1px solid #ddd;
  border-right: 1px solid #ddd;
  background-color: #f1f1f1;
  box-sizing: border-box;
}

.btn {
  font-size: 18px;
  display: inline-block;
  padding: 8px 12px;
  font-weight: 500;
  text-decoration: none;
  border-radius: 6px;
  color: #fff;
  background-color: #ddd;
  opacity: .8;
}

.btn:hover {
  opacity: 1;
}

.btn-normal {
  background-color: #6ba;
}

.btn-warn {
  background-color: tomato;
}

.info {
  font-size: 12px;
  color: #ccc;
}

#WebRtc4npapi,
#audio_output {
  display: none;
}