body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
}

header {
  background-color: #333;
  color: #fff;
  padding: 20px;
}

nav {
  background-color: #444;
  color: #fff;
  padding: 10px;
}

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

nav li {
  display: inline-block;
  margin-right: 20px;
}

nav li:last-child {
  margin-right: 0;
}

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

main {
  padding: 20px;
}

h1, h2, h3 {
  font-weight: normal;
}

h2 {
  font-size: 28px;
  margin-top: 0;
}

h3 {
  font-size: 20px;
  margin-top: 20px;
  margin-bottom: 10px;
}

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

li {
  margin-bottom: 10px;
}

a {
  color: #333;
  text-decoration: none;
}

footer {
  background-color: #333;
  color: #fff;
  padding: 10px;
  text-align: center;
}