body {
  font-family: 'Segoe UI', Roboto, sans-serif;
  margin: 0;
  padding: 0;
  background: #FFFFFF;
  color: #45494E;
}
header {
  background: #F0DB00;
  padding: 2rem;
  text-align: center;
}
nav {
  background: #C0C0C0;
  padding: 1rem;
  text-align: center;
}
nav a {
  margin: 0 1rem;
  text-decoration: none;
  color: #45494E;
  font-weight: bold;
}
main {
  padding: 2rem;
}
section {
  margin-bottom: 2rem;
}
footer {
  background: #C0C0C0;
  text-align: center;
  padding: 1rem;
  margin-top: 2rem;
  font-size: 0.9rem;
}
@media screen and (max-width: 600px) {
  header h1 {
    font-size: 1.5rem;
  }
  nav a {
    display: block;
    margin: 0.5rem 0;
  }
}