Hi DJ_BALOGH,

First you have to make sure that you have the CategoryTemplate.WithPictures selected from the administration of the mega menu plugin.
Then you need to change your code slightly as displayed below:

foreach (var category in Model.CategoriesModels)
        {
    <li><a href="@Url.RouteUrl("Category", new { SeName = category.CategoryModel.SeName })">@category.CategoryModel.Name</a>
        @if (category.SubCategories.Count > 0)
        {
            <div class="dropdown categories fullWidth [email protected]">"


then in the MegaMenu.css file add the following:

.dropdown.cat-id-77 
{
// your custom styling goes here
}


provided that the id of the category is 77.

Hope that helps!

Please let us know how it goes. If you can send us a link to your store it might be easier for us to see what might be wrong.