I recommend that you look at the CSS files for blueprintcss.org, and
see how this is done:
http://blueprintcss.org/css/latest.css
Always make sure you link to your custom CSS file AFTER you link to
the blueprint files in the <head> of your HTML page.
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Christian Montoya
mappdev.com :: christianmontoya.net
I created that CSS file myself. This is all about making your own
custom CSS files to style your webpage beyond what Blueprint will do.
You should learn a bit about CSS to understand this.