In Adobe Photoshop CC, open the image you'd like to add a border to. Check the layer's box in the bottom right hand corner. If you see "Background" proceed to step 2.

For this image, there will be a border of 15 pixels all around. that means that the Height and Width values will have to be 30 pixels respectively. That will ensure that each side has a 15 pixels ...

In this table-themed HTML tutorial, I’ll explain how to make a basic table, add and remove borders, create layouts, make cells the shape and size you want, place cell contents, and add color.