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

nav {
    background-color: #007bff;
    padding: 15px;
    text-align: center;
    position: sticky;
    top: 0;
    width: 100%;
    z-index: 1000;
    box-shadow: 0px 4px 6px rgba(0, 0, 0, 0.1);
}

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

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

nav ul li a {
    text-decoration: none;
    color: white;
    font-size: 18px;
    padding: 10px 15px;
    border-radius: 5px;
    transition: all 0.3s ease;
}

nav ul li a:hover {
    background-color: #0056b3;
}

nav ul li a.active {
    background-color: #ffcc00;
    color: #333;
    font-weight: bold;
}

.menu-icon {
    display: none;
    font-size: 24px;
    cursor: pointer;
    color: white;
}

@media (max-width: 768px) {
    nav ul {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 50px;
        left: 0;
        width: 100%;
        background-color: #007bff;
        text-align: left;
    }

    nav ul li {
        padding: 10px;
        width: 100%;
    }

    nav ul li a {
        display: block;
        width: 100%;
    }

    .menu-icon {
        display: block;
    }
}
body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
}

nav {
    background-color: #007bff;
    padding: 15px;
    text-align: center;
    position: sticky;
    top: 0;
    width: 100%;
    z-index: 1000;
    box-shadow: 0px 4px 6px rgba(0, 0, 0, 0.1);
}

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

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

nav ul li a {
    text-decoration: none;
    color: white;
    font-size: 18px;
    padding: 10px 15px;
    border-radius: 5px;
    transition: all 0.3s ease;
}

nav ul li a:hover {
    background-color: #0056b3;
}

nav ul li a.active-tab {
    background-color: #ffcc00; 
    color: #333; 
    font-weight: bold;
    border-radius: 5px;
    padding: 8px 12px;
    transition: all 0.3s ease;
}

.menu-icon {
    display: none;
    font-size: 24px;
    cursor: pointer;
    color: white;
}

@media (max-width: 768px) {
    nav ul {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 50px;
        left: 0;
        width: 100%;
        background-color: #007bff;
        text-align: left;
    }

    nav ul li {
        padding: 10px;
        width: 100%;
    }

    nav ul li a {
        display: block;
        width: 100%;
    }

    .menu-icon {
        display: block;
    }
}