How to change Page Spacing:

You can add spacing to your whole website thereby distinguishing borders and elements from each other. You can modify the spacing between elements in the header, the footer, the main body, side bar etc. This is done by accessing the DESIGN MODE.

Here is how to change Page Spacing:

Step 1: Access DESIGN mode by clicking the DESIGN icon.
Step 2: Click on the body tab.Step 3: Choose which part of the page you want to edit (i.e. header, footer, main body etc).Step 4:Click the SPACING TOOL 
Step 5:Click override and modify your spacing (inner/outer or both) as per your requirement.
In the example below,we are creating both inner (RED outline) and outer (WHITE outline) spacing for the HEADER.