body {
    width: 1120px;
    margin: auto;
    background-color: purple;
    color: limegreen;
}
nav {
    text-align: center;
}
nav a {
    display: inline;
}
div {
    background-color: darkgreen;
    border: groove darkgreen;
    padding: 0px 20px 20px 20px;
}
hr {
    height: 1px;
    border: 0;
    border-top: 1px solid limegreen;
}
a {
  color: darkorange;
  text-decoration: none;
  display: block;
}
a:hover {
  color: red;
  text-decoration: underline;
}
h1, h2, h3 {
  text-align: center;
}