nav {
    padding: 5px;
    background: #aaa;
}

li {
    display: inline-block;
}

a {
    padding: 20px;
    text-decoration: none;
    font-size: 20px;
    color: rgb(255, 255, 255);
    text-transform: uppercase;
}

a:hover {
    background:#E50000;
}