I need to incorporate LibreCalc documents into a web site I am constructing. What file type should I convert them to which will retain exactly the typography, layout etc.

I need to incorporate some docs made in OfficeCalc into a web site I am constructing. What file type should I convert these to which will preserve the typography and layout exactly? Ones I have tried turn out differently.

Which application do you use to “construct” your web site? Or do you “construct” your web site manually in an editor?