header.css

header>nav.menu>ul.menuList {
    margin: 0;
    padding: 0;
    display: inline;
}

.menuList>li.liHome>a.aHome[href="./"] {
    content: 'Home';
}

.menuList>li.liContactUs>a.aContactUs[href="./contact-us.html"] {
    content: 'Contact Us';
}

.menuList>li.liAboutUs>a.aAboutUs[href="./about-us.html"] {
    content: 'About Us';
}

.menuList>li {
    list-style: none;
    display: inline;
    margin-left: 4px;
}