Editing colors in body container

I recently created a blank page template using the following code:

(I am using the Nuntius Theme)

‘<?php
/*
Template Name: Blank Page
*/
//Display the header
get_header();
//Display the page content/body
if ( have_posts() ) while ( have_posts() )
{
the_post();
the_content();
}

//Display the footer
get_footer();
?>’

The problem is that instead of just having a plain white container area it is two different colors, white (#fffff) and some light gray in the right third of the page. If you go to the site you will see the slight difference.

(styletheology.com)

Where would I go in the stylesheet to make sure the container is all a uniform color?

Thank you so much for any help in advance!