* {
  box-sizing: border-box;
}

body {
  max-width: 40em;
  margin: 0 auto;
  padding: 20px;
  background: #fff;
  color: #000;
  font-family: "MS Gothic", "MS Mincho", monospace;
  line-height: 1.8;
}

main {
  width: 100%;
}

h1,
h2 {
  font-weight: normal;
}

h1 {
  margin: 0;
  font-size: 1.2em;
}

h2 {
  margin: 0 0 0.25em;
  font-size: 1em;
}

section {
  margin: 1.5em 0;
}

canvas {
  display: block;
  width: 100%;
  aspect-ratio: 1 / 1;
  margin: 1em 0 1.5em;
  background: #fff;
  border: 1px solid #000;
  image-rendering: pixelated;
  cursor: crosshair;
}

output {
  display: block;
  margin: 0;
  font-size: 0.9em;
}

button {
  font: inherit;
}

.button-group {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5em;
}

button {
  margin: 0;
  padding: 0.15em 0.6em;
  border: 1px solid #000;
  border-radius: 0;
  background: #fff;
  color: #000;
  cursor: pointer;
}

button:hover {
  background: #000;
  color: #fff;
}

button:focus-visible {
  outline: 1px solid #000;
  outline-offset: 3px;
}