html,
body {
  padding: 0;
  margin: 0;
  background-color: #555;
}

canvas {
  position: fixed;
  top: 0;
  bottom: 0;
  left: 0;
}

.controlpanel {
  position: fixed;
  left: 0;
  bottom: 0;
  background-color: gray;
  padding: 0px 5px;
  border-radius: 5px;
  padding-bottom: 5px;
}

#output {
  display: none;
  position: fixed;
  bottom: 0;
  right: 0;
  width: 100%;
  height: 200px;
}