:root { color-scheme: light; }
* { box-sizing: border-box; }
body {
  max-width: 640px;
  margin: 0 auto;
  padding: 24px;
  font-family: sans-serif;
  line-height: 1.5;
  color: black;
  background: white;
}
h1 { font-size: 24px; }
h2 { font-size: 18px; }
section { margin-top: 28px; }
label { display: block; margin-bottom: 6px; }
input { width: 100%; max-width: 320px; }
input, button { font: inherit; padding: 6px 8px; }
button { cursor: pointer; }
button:disabled { cursor: wait; }
code, pre { overflow-wrap: anywhere; }
pre { white-space: pre-wrap; }
summary { cursor: pointer; }