/* styling li elements in the header with the navigation and nav-btn classes */
header .navigation li .nav-btn 
{
    padding: 10px;
    background-color: #000;
    color: #fff;
}

/* styling li elements in the header with the navigation and nav-btn classes after hover action */
header .navigation li .nav-btn:hover
{
    background-color: #ff0157;
    color: #fff;
}