header {
    background-color: black;
    color: #fff;
    padding: 20px;
    text-align: center;
    font-size: 20px;
    font-weight: bold;
    position: sticky;
    top: 0;
    z-index: 100;
}

nav {
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: #333;
    color: #fff;
    text-align: center;
    font-size: 20px;
    font-weight: bold;
}

.nav-links {
    display: flex;
    width: 100%;
}

.navigation-button {
    flex: 1;
    text-decoration: none; 
    padding: 8px 16px;
    background-color: #f0f0f0; 
    border: none;
    border-radius: 0px;
    color: black;
    cursor: pointer;
    font-family: 'helvetica', sans-serif;
}

.navigation-button:hover {
    background-color: #e0e0e0;
}

/* Add hamburger menu button */
.hamburger {
    display: none;
    cursor: pointer;
    padding: 10px;
    background: none;
    border: none;
    color: white;
}

.hamburger span {
    display: block;
    width: 25px;
    height: 3px;
    background-color: white;
    margin: 5px 0;
    transition: all 0.3s ease;
}

/* Mobile styles */
@media screen and (max-width: 768px) {
    nav {
        flex-direction: column;
        position: relative;
    }
    
    .hamburger {
        display: block;
        align-self: flex-end;
    }
    
    .nav-links {
        display: none;
        width: 100%;
        flex-direction: column;
    }
    
    .nav-links.active {
        display: flex;
    }
    
    .navigation-button {
        flex: 1;
        idth: 100%;
        text-align: left;
        padding: 15px;
    }
}