body {
    font-family: Arial, sans-serif;
    line-height: 1.5;
    margin: 0;
    padding: 0;
}

#header {
    background-color: #f2f2f2;
    padding: 20px;
}

#nav {
    list-style: none;
    margin: 0;
    padding: 0;
}

#nav li {
    display: inline;
    margin-right: 15px;
}

#nav li span {
    font-weight: bold; /* Aktive Seite */
}

#content {
    padding: 20px;
}

#footer {
    background-color: #f2f2f2;
    padding: 10px;
    text-align: center;
}