:root {
  color-scheme: light dark;
}
body {
  text-align: center;
}
table {
  margin-left: auto;
  margin-right: auto;
}
pre {
  margin: 0;
  border: light-dark(#ddd, #444) 1pt solid;
  border-radius: 5px;
  padding: 8px;
  background-color: light-dark(#eee, #222);
  white-space: pre-wrap;
}
input[type=number] {
  text-align: center;
  width: 4em;
}
canvas {
  width: 100%;
  height: 300px;
}