I disable all compression tools and delete my Browser cache. Add !important to code. But not change.

I could not see an "important" behind the code.
BTW you can edit the section space directly at the Theme configuration > Background

Good Morning dear, resolve top and bottom space from Theme configuration > Background.
But Left and Right Margin, how can I resize it?

Hi there,
you can do this in same way.
Just anaylze the css and then insert the cusromized css code to your css/custom.css
Here is a video how to find the css styles and codes.
www.joomlaplates.com/template-customizing