How can I apply borders/background color to split a section

I want to split section B up into 4 sections - Session 1, 2, 3 and 4 and would if possible like to do this visually by CSS using borders or background colours. Can I access the HTML or is there an easier way?

As previous indicated in you other ticket, you can also inject the following CSS code to place a background color for certain fields

#id_6,#id_7 {

    background-color : blue;

}

 

Please let us know if you require additional assistance.

How to Inject Custom CSS Codes