grunge theme sidebars

the following grunge theme https://wordpressthemesforfree.com/view/657.html I have just applied to my blog lekhanhminh.co.cc . I’m pretty satisfied but there’s just 1 thing I don’t know how to do: I want to increase the width of sidebar1 and sidebar2 and also the width of the main content part on the left for my blog to look nicer. I’m must confess that I’m no good at coding and stuff, just learning from practice. It would be kind of you who can help.
Here’s the theme’s style.css the sidebarpart :

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