body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  max-width: 640px;
  margin: 0 auto;
  padding: 40px 20px 80px;
  line-height: 1.6;
  color: #222;
}

header {
  margin-bottom: 40px;
}

h1 {
  margin-bottom: 4px;
}

h2 {
  margin-top: 40px;
}

ul {
  padding-left: 20px;
}

form {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-top: 20px;
}

label {
  font-weight: bold;
  margin-top: 12px;
}

input, textarea {
  font: inherit;
  padding: 8px;
  border: 1px solid #999;
}

button {
  margin-top: 16px;
  padding: 10px 20px;
  font: inherit;
  border: none;
  background: #222;
  color: #fff;
  cursor: pointer;
  width: fit-content;
}

button:hover {
  background: #444;
}

footer {
  margin-top: 60px;
  color: #666;
  font-size: 0.9em;
}