org.openoffice.da.writer2xhtml.oxt/Configuration/Stylesheets.xhp Stylesheets Use this page to provide your own style sheets for the exported documents.

Choose Tools - Options - Writer2xhtml - Style sheets

Custom style sheets The custom style sheet can either be an embedded style sheet for the EPUB export or a linked style sheet for the XHTML export. Insert link to custom style sheet (XHTML export) Check this to link to your own, external CSS style sheet. For more advanced solutions (eg. different style sheets for screen viewing and printing) you can use an XHTML template. URL Enter the URL for the style sheet. Include custom style sheet (EPUB export) Check this to include a custom style sheet in the EPUB document. Load... Click to load the style sheet from a file.