# Why wont CSS auto center hack not work?

**URL:** https://forum.kirupa.com/t/why-wont-css-auto-center-hack-not-work/301640
**Category:** web dev
**Created:** [December 12, 2009, 11:33pm UTC](https://forum.kirupa.com/t/why-wont-css-auto-center-hack-not-work/301640 "2009-12-12T23:33:59Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![jeffonfire](https://avatars.discourse-cdn.com/v4/letter/j/67e7ee/32.png) [@jeffonfire](https://forum.kirupa.com/u/jeffonfire)
#### Post date: [December 12, 2009, 11:33pm UTC](https://forum.kirupa.com/t/why-wont-css-auto-center-hack-not-work/301640/1 "2009-12-12T23:33:59Z")

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Why wont CSS auto center hack not work?  
I tried this:  
#wrapper {  
width: 800px ;  
margin-left: auto ;  
margin-right: auto ;  
}  
It didn’t work, I don’t know whats wrong, I have used this before but don’t know what the problem is.