* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
body {
  display: flex;
  flex-direction: column;
  padding: 1rem;
  align-items: center;
  background-color: black;
}
.hidden {
  display: none;
}
button {
  display: block;
  padding: 0.25rem 0.5rem;
  border: none;
  font-size: 1.5rem;
  background-color: yellow;
  border-radius: 10px;
  margin: 3rem 0rem;
  transition: all 0.2s;
}
button:hover {
  transform: scale(1.2);
  cursor: pointer;
}
#myCanvas {
  background-color: black;
  border: 10px solid lightpink;
}

#rule {
  color: white;
  font-size: 1.15rem;
  width: 300px;
  height: 100px;

  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}