Deliver Dropdown-menu width


I want to change the width of the dropdown menu in the deliver theme.
How can I achieve that?

I have found the following in /themes/deliver/scss/configuration/nucleus:

// Dropdowns
$dropdown-width: 140px !default;
$flyout-width: 140px !default;
$dropdown-col-width: 170px !default;
$dropdown-col-height: 200px !default;

But even if I change the values there it doesn’t get updated on the page itself. It just ignores it.

Thank you