submenu backgroundbox size

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Hello,
the background-box from the sub-menu of the dropdown-menu item ‘Winkeliers” is 225×51.5.

Because the background-box is 225px the sub-menu text ‘WCKB goes non-profit voor winkels met één filiaal’ is running out of the dark background-box.
Is it possible to change the background-box in a larger width? (Only for the sub-menus).

Thanks in advance