The CSS styles disappeared after usage of the HTML Include Macro??

[mitapana]

This question is in reference to Atlassian Documentation: HTML Include Macro

I tried to embed the HTML page with the HTML Include Macro. After embedding the HTML page, the CSS styles disappeared in the page. How to enable the CSS styles??

[mitapana]

The HTML Include Macro is embedding pure HTML and then the Confluence styles are applied to the page. This is ok, because I don't need to do my own css at all.