Submenu width

Hi,

We are currently fine-tuning the website for Woningverwarming.nl
As you can see under Assortiment there is a submenu which doesn't fill up right.

I already tried to use the custom CSS below but there is a custom header plugin used for this. How can we fix it so it will fill up nicely?

#Top_bar .menu li ul li { width: 250px !important; }

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