body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
}

header {
    background-color: #333;
    color: #fff;
    padding: 10px 0;
    position: relative;
}

.nav-title {
    font-size: 24px;
    text-align: center;
    margin-bottom: 10px;
}

.menu-toggle {
    display: none;
    font-size: 24px;
    cursor: pointer;
    position: absolute;
    top: 10px;
    right: 20px;
}

nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
}

nav ul li {
    position: relative;
    margin: 0 15px;
}

nav ul li a {
    color: #fff;
    padding: 10px 20px;
    display: block;
    text-decoration: none;
}

nav ul li ul {
    position: absolute;
    top: 40px;
    left: 0;
    background-color: #444;
    display: none;
    min-width: 200px;
    z-index: 1000;
}

nav ul li:hover ul {
    display: block;
}

nav ul li ul li {
    display: block;
}

nav ul li ul li a {
    padding: 10px;
}

main {
    padding: 20px;
}

main #introduction {
    text-align: center;
}

main #courses-overview {
    margin-top: 20px;
}

.course {
    margin-bottom: 40px;
}

.course h3 {
    color: #333;
    text-align:justify;
}

.course p {
    color: #666;
    text-align:justify;
}

.course img {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 10px auto;
    border: 2px solid #ddd;
    border-radius: 5px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

footer {
    background-color: #333;
    color: #fff;
    text-align: center;
    padding: 10px 0;
    position: relative;
    bottom: 0;
    width: 100%;
}

/* Responsive Styles */
@media (max-width: 768px) {
    .menu-toggle {
        display: block;
    }

    .nav-title {
        text-align: left;
        margin-left: 20px;
    }

    nav ul {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background-color: #333;
        z-index: 1;
    }

    nav ul li {
        margin: 0;
    }

    nav ul li a {
        padding: 10px;
    }

    nav ul li ul {
        position: static;
        background-color: #444;
    }

    nav.active ul {
        display: flex;
        flex-direction: column;
    }
}

@media (min-width: 769px) {
    .menu-toggle {
        display: none;
    }
}