.menu ul {
    display: flex;
    background-color: green;
}
.menu a {
    color: white;
    text-decoration: none;
    text-transform: uppercase;
    display: block;
    padding: 20px;
}
.menu li {
    border-right: 1px solid hsla(0, 0%, 0%, 0.25);
}
.menu li:last-child {
    border: none;
}
.menu a:hover {
    background: hsla(0, 0%, 0%, 0.25);
}
#mobile-menu {
        display: none;
}