How to use body tools:

First get into Design mode. Next, Click body and choose the layer: header, body, or footer. Finally click one of the tool icons. Body tools include: background, image, text, border, radius, spacing, and shadow.

Here is how to use body tools:

Step 1: Get into design mode.

Step 2: Click on the Body tab. 

Step 3: Choose the layer. 

Step 4: Choose the tool.  

Add any of these tools to the area you are editing.

The website is built like layers. Any definitions set to a specific "layer" section will be applied to the entire site and can be changed. (see inherency.) You can change the: Background ColorBackground ImageSpacing Border ShadowWebsite TextCorners of the whole website. 
Note: See Style for more information.