Inline content generally is made at the point of the final "output" of the link/content. That said, the best help/answer is obtained through more information. Ie. What website, what specific default content is to be modified, what plugin(s) or other modifications have been made to what file(s) that may be related to the content being modified. Applying css would require ensuring that there is a css "way" to reference it. Specific css files can be generated for specific "conditions" as outlined in the css_readme file found in includes/templates/template_default/css/
As for the other changes, will have to review a little to see what options are available and how to apply them.
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