body {
  font-family: 'Roboto', sans-serif;
  margin: 0;
  background-color: #f0f4f8;
  color: #333;
}

header, main, footer {
  max-width: 640px;
  margin: 1rem auto;
  padding: 1rem;
  border: 1px solid #ccc;
  background-color: #cce0ff; 
}

h1, h2 {
  margin-top: 0;
}

main {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

section {
  background-color: white;
  padding: 1rem;
  border-radius: 4px;
}

footer {
  text-align: center;
  font-size: 0.9em;
}

@media screen and (min-width: 500px) {
  header {
    background-color: black;
    color: white;
  }

  main {
    grid-template-columns: 1fr 1fr; 
  }
}