how to define font style of embed tag in html

I was paused in the point of defining font-family in embed tag of html because i defined the Cssclass and mentioned in the style tag too,but it doesn't change.

so I need a suggestion for changing font style in embed tag. In embed tag, content is uploaded by the admin panel simultaneously. We need to define the font style using css,is there any way to do that?

code

<embed  src="result/Career.txt" class="auto-style4"  />