How to create mega menu with columns in CSS and Elementor | Menu dropdown with columns - NO PLUGINS

I have been looking for this for sometime now. Kindly share the code. Thank you.

Hi, thanks for the video. How do I add a title for my columns ?

Thanks, that was helpful

Hi! Thank you for the video, when I put custom css
@media (min-width: 1024px) {
selector .elementor-nav-menu li
:nth-child(1) .elementor
-nav-menu--dropdown{
column-count: 2 !important;
}
}

but it appears error icons at left, can please type the code here as comment? Why this doesn't work?