you can still edit the css directly if you wish, though which css file to edit depends on the design theme you are using.
for example, if you are using the default design theme, the css file is at:
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.