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

body {
  font-family: Arial, sans-serif;
  line-height: 1.6;
  background-color: #f4f4f4;
  color: #333;
  padding: 0;
  margin: 0;
}

header {
  background: #333;
  color: #fff;
  padding: 1rem 2rem;
}

header h1 {
  margin-bottom: 0.5rem;
}

nav a {
  color: white;
  margin-right: 1rem;
  text-decoration: none;
}

nav a:hover {
  text-decoration: underline;
}

main {
  padding: 2rem;
}

footer {
  text-align: center;
  padding: 1rem;
  background-color: #333;
  color: white;
  position: fixed;
  width: 100%;
  bottom: 0;
}

@media (max-width: 600px) {
  header,
  main,
  footer {
    padding: 1rem;
  }

  nav a {
    display: block;
    margin: 0.5rem 0;
  }

  footer {
    position: static;
  }
}