CSS + WebHelp

I'm having problems with my generation Webhelp Adobe Robohelp 11. I use a template with a CSS file, but the file I set the CSS "font-family: Segoe UI, Tahoma," and at the time of developing these settings are typically applied but after generating the webhelp the font that appears in browsers is not any of that set, but the Times New Roman.

Googled and not found similar problem. The .chm file is generated normally.

Thanks!