body {

  font-family: system-ui, sans-serif;

  margin: 0;

  padding: 0;

  background-color: #f6f8fa;

  color: #222;

  display: flex;

  flex-direction: column;

  align-items: center;

  min-height: 100vh;

}

header {

  text-align: center;

  padding: 2rem 1rem;

}

main {

  flex: 1;

  display: flex;

  flex-direction: column;

  align-items: center;

}

button {

  background-color: #0070f3;

  color: white;

  border: none;

  border-radius: 8px;

  padding: 0.75rem 1.5rem;

  font-size: 1rem;

  cursor: pointer;

  transition: background-color 0.2s ease;

}

button:hover {

  background-color: #0059c1;

}

footer {

  background: #eee;

  width: 100%;

  text-align: center;

  padding: 1rem;

}