How to merge HTML and CSS into one file and remove JavaScript?

Question

css

I wanted to sell personal items through Ebay (a lot), I read that it is desirable to create a so-called. listing (design description) and not just text.
I bought the Sparkle Visual Web Design program (type constructor). I uploaded the necessary photos to the hosting, and indicated direct links. All photos are uploaded and in the program everything looks as intended. (I put the photo in a row, 3 photos side by side; I also used a button, box, and seemingly standard fonts)
After exporting the project, there are three files: html/css/js. I tried to insert html in the description on Ebay and of course everything slipped and 3 boxes disappeared altogether. Also, Ebay began to swear at js, OpenSans fonts, Arial generally replaced it with incomprehensible things.
Is there a way to combine html, css, and also remove js?
I don't know much about programming. But I noticed in the code that there are links to connecting css style.
Is it possible to upload css to the hosting and connect it just like a photo - with a direct link?
Thank you!

Answer 1

write in the head of the html file

<style>
сюда вставить весь .css
</syle>

fonts to use standard eg. arial without loading from outside
or loading from a folder