body 
{
    margin: 0;
    padding: 0;
    color: White;
    font-family: Verdana;
}

#header 
{
    background-color: #343434;
    padding: 20px;
    text-align: center;
}

#nav 
{
    width: 100%;
    background-color: #343434;
    border-bottom: 3px solid black;
}

#nav-open-btn,
#nav-close-btn
{
    position: absolute;
    right: 10px;
    top: 10px;
    background-image: url(nav-icon.png);
    display: block;
    width: 20px;
    height: 20px;
    display: none;
}

#nav ul 
{
    list-style: none;
    padding: 10px;
    margin: 0;
    text-align: center;
}

#nav ul li
{
    display: inline-block;    
    padding: 5px;
}

#nav ul li:hover, .selected
{
    background-color: #26a5e0;
}

@media (max-width: 480px) 
{
    #nav {
        position: absolute;
        top: 0px;
    }

    #nav ul {
        margin-top: 25px;
    }

    #nav ul li 
    {
        display: block;
    }
    
    /* Der Link zum öffnen/schließen des Menüs ändern den Anker #nav */
    #nav:not(:target)
    {
        display: none;       
    }
    
    #nav-open-btn, #nav-close-btn
    {
        display: block;
    }
}