How can I get rid of the grid in the background?

Hello, 

I created a gallery on my website and added its shortcode in the code item on my website. The website url is: www.raybassil.com 
I don't know why, but this https://pasteboard.co/GNb6vnZ.png background is set behind my code items. I can't figure out how to remove it. How can I get rid of it?

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