You've changed the template stylesheet to remove some unnecessary formatting. Again, you've experienced how easy it is to use the built-in CSS editor to tweak the current template's layout.

As you've seen, there are two ways to influence the look and feel of your current template. The first way is tweaking the template parameters; the second is editing the template stylesheet. Have a go and experiment a little with the built-in template parameters. Get a feel for the effects that the different parameters have by trying out some width settings and color combinations. Pick your flavor, click on Apply, and click on Preview to see the output on the frontend.

You'll notice that template parameters only allow you to change a limited set of options. It's far more powerful to take a look under the hood and edit the template CSS files in the Joomla! editor. That way, your layout options are only limited by your CSS skills. Take a scroll through the template editor CSS files to get a feel for what coding in CSS is like—you'll notice that CSS rules are, for the most part, written in plain English and don't look at all difficult to understand.