Theme Style Override

I am working with a theme that uses a composer for sections on the page. Each section’s CSS uses identical Classes and IDs. I want to style each segment separately. I have already installed plugins for applying style and scripts per page, I just need to ensure that I can select and then apply these styles to each section. Due to an NDA I cannot give the site address, the theme is called SimpleMag.

A couple Screenshots I can Share:
Screenshot 1
Screenshot 2

the code I have initially used but does not seem to be working is this:

(
	function($)
	{
		$(".home-section .section-header .title span:contains('Category A')").css('background-color', 'blue', 'important');
	}
)
(
	jQuery
);

Maybe I am doing something wrong, but I need to get this done quickly.

Thank you in advance for any assistance.