body {
  background-color: black;
  color: white;

}

header {
  background-color: #666;
}

h1 {
  color: white;
  text-align: center; 
  border: 4px;
  border-color: gray; 
  border-style: double; 
}

nav {
  background-color: gray;
  float: left;
  text-align: center;
}

ul {
  list-style-type: none;
  margin: 0;
  padding: 0;
  overflow: hidden;
  background-color: #333333;
  display: flex;
}

ul li {
  float: left;
}

ul li a {
  display: block;
  color: white;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
}

ul li a:hover {
  background-color: #111111;
}

active {
  background-color: white;
}

footer {
  text-align: center;
}