body {
  margin: 0;
  background-color: black;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

canvas {
  position: absolute;
  display: block;
  z-index: 0;
  border: 2px solid white;
}

.menu {
  z-index: 1;
  display: flex;
  flex-direction: column;
}

.start {
  margin: 10px;
  width: 100px;
  height: 30px;
  background: white;
  border: 1px solid black;
  cursor: pointer;
}

#character {
  width: 100px;
  margin: 10px;
  padding: 10px;
}