Load the style sheet containing your CSS code. If you do not use separate style sheets, the CSS will be located between the tags at the top of your HTML file. Scan through the CSS code and and ...

Save the file as "index.html". Create another HTML page in the same manner, saving it as "included.html". Write whatever header information you want into the "included.html" file.

Pick the right tool. The good news is you don't need to hire a graphic design company to create an effective banner ad. You don't even need any expensive software.