Custom screen width for scales with long lables

Hi,
how can I force qualtrix to display matrix like questions well formatted and without any horizontal scrolls?

I already forced bigger width for entire survey (using classic layout)

.Skin .SkinInner {min-width: 1000px!important;}

But this seems to be not enough to display my questions properly:

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Here we see uneven spacing.

And here both uneven spacing and scrolling:

!

How can I make it work properly?
Is there any documentation for all the CSS codes recognized by qualtrics? Like .SkinInner and so on?