html, body { margin: 0; }
body {
  background: #fff;
  color: #000;
  font: 16px/1.4 Arial, Helvetica, sans-serif;
}
main {
  max-width: 28rem;
  margin: 0 auto;
  padding: 3.5rem 1rem 4rem;
}
h1 {
  font-weight: 700;
  font-size: 2.4rem;
  margin: 0 0 1rem;
  letter-spacing: -0.06em;
}
textarea, button {
  font: inherit;
  width: 100%;
  box-sizing: border-box;
}
textarea {
  border: 2px solid #000;
  padding: 0.7rem;
  margin-bottom: 0.6rem;
  resize: vertical;
}
button {
  background: #000;
  color: #fff;
  border: 0;
  padding: 0.7rem;
  cursor: pointer;
  margin-bottom: 1.2rem;
}
#dl { background: #fff; color: #000; border: 2px solid #000; }
#box { display: flex; justify-content: center; }
#box img { image-rendering: pixelated; width: min(18rem, 100%); height: auto; }