body {
  font-family: Arial, ;
  margin: 0px;
  padding: 0px;
  background: black;
  color: white;
}

header {
  background-color: white;
  color: black;
  padding: 30px;
  text-align: center;
}

nav a {
  color: black;
  margin: 0 15px;
  text-decoration: none;
  font-weight: bold;
}

section {
  padding: 40px 20px;
  max-width: 800px;
  margin: auto;
}

footer {
  text-align: center;
  background-color: black;
  padding: 15px;
  font-size: 14px;
}