.header .main-menu > li.contact-highlight > a {
    background: #4CAF50;
    color: #fff !important;
    padding: 10px 22px;
    border-radius: 6px;
    font-weight: 600;
    transition: all 0.3s ease;
}

.header .main-menu > li.contact-highlight > a:hover {
    background: #3e8e41;
    color: #fff !important;
}