I now see that the style sheet is meant to style something in a html element. That is a different story. You have a massive css file, and if the text in your html element is that whole page that we have seen in some of your screenshots, I think you are in trouble.
I have added inline styling to elements in the html element, and that has worked well, but I'm talking about a small bit of html with some few styling rules.
What you could try, but I don't know if it will work well, is wrapping your css into the <style></style> tags and paste it into the html element too, just before the other content. If you are lucky, it may work.
If luck is not on your side, then you'll have to bite the bullet and pop the text into containers and paragraphs onto the actual page in RSD, and then it should be possible to have the css file in the resources. But I see it is called 'main'. There is already a 'main.css' generated by the programme, so you'd better give it a different name.

Hi, Inger,

Your suggestion to bundle the CSS Style xode with .html code solved the problem, at https://fund.cfored.com/payment.html

Thank you, very much,
Harold

Oh, good! I didn't know that wee black box was able to swallow that much code all at once