.custom-mega-menu {
    background: #fff;
    padding: 20px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.15);
}
.custom-mega-menu .menu-items {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-wrap: wrap;
}
.custom-mega-menu .menu-items li {
    margin: 10px;
}
.custom-mega-menu .menu-items a {
    text-decoration: none;
    color: #333;
}
@media(max-width:768px) {
    .custom-mega-menu {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        overflow-y: auto;
        z-index: 9999;
    }
    .custom-mega-menu .menu-items {
        flex-direction: column;
        align-items: flex-start;
    }
}