Overriding all the css in 1.6

[beepow]

Hello, is it possible to override all the css editing only one file?

I mean: I have to change a lot of rules in some of the css (like: blocksearch.css, blockcart.css, global.css, superfish-modified.css, blocktopmenu.css, homeslider.css).
Should I edit each of the separately or Is there a way to achieve the same result by modifing only one file (eg: global.css....)?
Maybe I should see which one is loaded as last?

I'm using default theme in PS 1.6.1.14

thanks in advance.

[NemoPS]

The only way I know, since the modules load after global.css, is using !important. Not clean, but it works.
Alternatively just be more specific if possible, so if one rule is 

.box {background: white}

You write

.content .box {background: blue}

[beepow]

Got it! Thank you, I'll try this solution in my next project.