html {
  font-size: 100%;
}

body {
  margin: 0;
  font-family: Arial, sans-serif;
  line-height: 1.6;
  background-color: #f4f4f4;
  color: #222;
}

header {
  background-color: #222;
  color: #fff;
  text-align: center;
  padding: 2rem 1rem;
}

h1 {
  margin: 0 0 1rem;
}

nav ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

nav li {
  display: inline-block;
  margin: 0 0.75rem;
}

nav a {
  color: #fff;
  text-decoration: none;
}

main {
  max-width: 800px;
  margin: 2rem auto;
  padding: 0 1rem;
}

section {
  background-color: #fff;
  margin-bottom: 1.5rem;
  padding: 1.5rem;
  border: 1px solid #ddd;
}

h2 {
  margin-top: 0;
}

footer {
  text-align: center;
  padding: 1rem;
  background-color: #222;
  color: #fff;
}