Same width of 2 sidebars and line

Hi,
is there a possibility to get the same width of both sidebars? At the moment one has 340px width and the second one — 260px. Is it possible to change width of those sidebars to 300px and 300px? How? Attempts to change the css spoil the whole site.
The lines separating the modules do not move.

EDIT: I have made the s2’s width equal to 340px, so they are now the same, but I have a problem with this line, which is still 260px from the border. What can I do with this line? Screen here: https://i.imgur.com/aGXvSuC.png

• This topic was modified 4 years, 10 months ago by mwolanin.