How to change the layout?

Hi,

I have a weird behavior on this sitemap page.

I created a WordPress page and I iserted the Sitemap shortcode into it like this.

1 – Can you see there is both a grey and white backgrounds?

2 – Also, how can I remove the Bold on the Heading? And the links?
As you can see on the other pages of my site, my headings are not in bold.

Please note I’m not a coder. Please be specific on how I can edit the CSS.

Thank you so much.

The page I need help with: [log in to see the link]