html, body {
  margin: 0;
  padding: 0;
  background-color: rgb(20, 20, 20);
}

button {
  background-color:skyblue;
  border: none;
  border-radius: 4px;
  transition: all 0.5s ease-in-out;
}

button:hover {
  background-color: deepskyblue;
}

canvas {
  display: block;
}