How to make a theme fluid?

How do I make the theme Im using fluid, or change its width?

 

Appearance - > Style Properties -> Choose your Style -> General -> Page width Controller:

Code:

width: 98%;
margin: 0 auto;

 

I tend to make my width 85 - 90% but the theory is the same.

 

yep, adjust the 98% to whatever you'd like, Elizabeth's % would probably work better for most

 

Thankyou @Russ this helped