no space between header and main content

[khalby786]

It would look nicer if there was some space between the header and the main content.

I would have made a PR but I'm unsure whether to add margin-top or margin-bottom to the main content or the header, respectively, mainly because the main content element seems to use absolute positioning with fixed top values which might complicate matters.

The above screenshot is from Firefox. For some reason, it looks good on Chrome:

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