header {
    background: #333;
}
@media (min-width: 1200px) {
    .header .ms-nav > li > a {
        padding: 0 10px 5px;
        border-bottom: 2px solid transparent;
        color: white;
		font-size:15px;
    }

    .header .ms-nav > li.active > a {
        border-bottom: 2px solid #157df1;
        color: #157df1;
    }

    .header .ms-nav > li:hover > a {
        border-bottom: 2px solid #157df1;
    }
}