Making a Banner for your CSS site
How to make a banner for your CSS template
Locate and open your existing CSS banner in Photoshop

Open a suitably sized (larger than 1024x768) image of your choice in Photoshop

Drag your chosen image across tabs and drop onto your existing template's banner - this makes sure the new one you are cretaing is exactly the right size

Use different attributes to control the way your new banner looks (Image > Adjustments > Variations and Filter > Blur > Gaussian Blur created this effect)

Add text and use the Layer style menu to change the way it looks!

Save and replace the existing banner you downloaded (be sure to save with the same file name)