* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html,
body {
  height: 100%;
}

body {
  overflow: hidden;
}

.panel {
  background: #000;
  height: 50%;
  left: 0;
  position: absolute;
  top: 0;
  width: 100%;
}

canvas {
  background: #000;
  bottom: 0;
  left: 0;
  margin: auto;
  position: absolute;
  right: 0;
  top: 0;
  z-index: 2;
}