Changing width of K2 Theme (again)

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I’m trying to change the width of my K2 theme again (on http://www.evildrganymede.net) – I posted about this here a few years ago ( https://wordpress.org/support/topic/changing-width-of-k2-theme/ ) and thought I’d found a solution but that doesn’t seem to work anymore.

I want to increase the width of my primary window further. Anyone know how to do this?