:root {
  color-scheme: light;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: #111827;
  background: #fff;
}

* { box-sizing: border-box; }
body { margin: 0; }
main {
  min-height: 100vh;
  min-height: 100svh;
  display: grid;
  place-items: center;
  padding: 2rem;
}
h1 {
  margin: 0;
  width: min(500px, 100%);
}
h1 img {
  display: block;
  width: 100%;
  height: auto;
}