.scrollmenu {
    background-color: #333;
    overflow: auto;
    white-space: nowrap;
}

.scrollmenu a {
        display: inline-block;
        color: white;
        text-align: center;
        padding: 14px;
        text-decoration: none;
    }

 .scrollmenu a:hover {
            background-color: #777;
}