html {
  background-image: url("background.jpg");
  background-repeat: no-repeat;
  background-position: center;
  background-size: cover;
}

body {
  margin: 0;
  width: 90%;
  margin-left: auto;
  margin-right: auto;
  font-family: Arial, sans-serif;
  color: white;
}

header img {
  width: 100%;
  height: 800px;
  object-fit: cover;
  display: block;
}

h1, h2 {
  text-shadow: 4px 6px 5px gray;
  color: white;
}

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

nav li {
  display: block;
  width: 20%;
  float: left;
}

nav a {
  display: block;
  background-color: #2c3e50;
  line-height: 2.8em;
  text-decoration: none;
  text-align: center;
  color: white;
}

nav a:hover {
  background-color: #1abc9c;
  color: white;
}

main {
  padding: 20px;
  margin-top: 35px;
}

main > img {
  width: 25%;
  float: right;
}
main > img[alt="Under Maintenance"] {
  float: none;
  display: block;
  margin: 0 auto;
}

body > footer {
  clear: both;
  text-align: center;
  padding: 15px;
  color: white;
}