I can suggest using JavaScript codes to create the CSS codes ahead of time and then just post the compiled CSS codes on the server for download by the client, r

I can suggest using JavaScript codes to create the CSS codes ahead of time and then just post the compiled CSS codes on the server for download by the client, rather than having the CSS codes being made up by the client. Also, I think you should not use the HTML "style" attribute; it is bad for accessibility. Use the "class" attribute instead.