html,
body {
  margin: 0;
  padding: 0;
  background-color: #000;
  font-family: "Courier";
  color: #fff;
  font-size: 12pt;
  line-height: 10pt;
}

body {
  width: 100vw;
  display: grid;
  justify-items: center;
}

canvas {
  display: block;
}

button {
  position: absolute;
  bottom: 0;
  width: 100%;
  color: #fff;
  background: rgb(143, 27, 211);
  border: 1px solid transparent;
  padding: 10px;
  font-size: 1.5rem;
  cursor: pointer;
}