body {
  font-family: -apple-system, BlinkMacSystemFont, sans-serif;
  padding: 16px;
}
h1 { font-size: 22px; }
.checklist label {
  display: block;
  margin: 6px 0;
}
canvas {
  border: 1px solid #000;
  margin-top: 8px;
}
button, select {
  margin-top: 12px;
  padding: 12px;
  width: 100%;
  font-size: 16px;
}