div background color not setting all area

Question

I have a div containing 3 div inside it. My problem is when am setting background color to first div, the div inside first div is not applying the background.

My code is

Answer 1

Try to add:

and give him style:

after the .how_next_last div

Example:

    

        

        
Heading
        
Description
    

    

        

        
Heading
        
Description
    

    

        

        
Heading
        
Description