body {
  font-family: sans-serif;
  text-align: center;
  margin: 40px;
}

video {
  width: 640px;
  height: 360px;
  background: black;
  margin-top: 20px;
}

#fileName {
  margin-top: 10px;
  font-weight: bold;
}

#volumeSlider {
  width: 300px;
  margin: 10px;
}

#dropZone {
  border: 2px dashed #aaa;
  padding: 20px;
  margin-top: 20px;
  color: #555;
  background: #f9f9f9;
}

#dropZone.hover {
  border-color: #00aaff;
  background: #eefaff;
}