* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: sans-serif;
  background-color: #f5f5f5;
  color: #222;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
}

main {
  text-align: center;
  padding: 2rem;
}

h1 {
  font-size: 2rem;
  margin-bottom: 1rem;
}

p {
  font-size: 1.1rem;
  margin-bottom: 1.5rem;
  color: #555;
}

button {
  padding: 0.75rem 1.5rem;
  font-size: 1rem;
  background-color: #2563eb;
  color: white;
  border: none;
  border-radius: 6px;
  cursor: pointer;
}

button:hover {
  background-color: #1d4ed8;
}

#mensagem {
  margin-top: 1rem;
  color: #16a34a;
  font-weight: bold;
}