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

body {
  font-family: Arial, sans-serif;
  line-height: 1.6;
}

header {
  background: #333;
  color: #fff;
  padding: 10px 0;
  text-align: center;
}

header nav ul {
  list-style: none;
}

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

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

main {
  padding: 20px;
  text-align: center;
}

footer {
  background: #333;
  color: #fff;
  text-align: center;
  padding: 10px 0;
  position: fixed;
  bottom: 0;
  width: 100%;
}