Making the megamenu dropdown as half of the width

1. Go back to Appearance > Menus.
2. Click on the caret on the top-right of menu item that contains the megamenu subitem to expand it.
3. In the CSS Classes text box, enter yamm-hw.
4. This will make the subitem extend to half-width of the container.
5. If the CSS Classes field is not visible. Click on Screen Options on the top-right corner of the screen and check on CSS Classess under Show advanced menu properties.
6. Click on Save Menu.

megamenu dropdown as Half of the width Output