How do I create MS-Edge style layout in Calibre Ebook Viewer?

Hi all

I'd like to recreate the MS-Edge layout on the Calibre Ebook Viewer.

Here is an example. I love the spacing on left, right, & in the middle.

I can continue reading on Ms-Edge but it's not supposed to be a reader and lacks many features.

Can someone please help me with the custom CSS?

Thanks
Vin

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