Here place your themes custom stylesheet (call it theme.css).

  It MUST be named theme.css and for AdaptiveThemes.com themes 
  it must include the license text.

  You can download a sample theme.css file with the license text included:
  http://adaptivethemes.com/documentation/base-theme
  
  If you need to add any other stylesheets to this directory each file must
  include the license text!