body {
    font-family: serif;
    padding: 30px;
}

h1 {
    font-size: 2.5em;
    font-weight: bold;
    margin-bottom: 30px;
}

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

nav ul li {
    margin-bottom: 4px;
}

nav ul li a {
    display: block;
    width: 150px;
    background-color: blue;
    color: white;
    text-align: center;
    padding: 6px 0;
    text-decoration: none;
    font-size: 1em;
    border: 2px solid transparent;
}

nav ul li a:hover {
    border: 2px solid red;
}