html - Can't change font size of a href -

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I want to change the font size of my single href which links back to the top of the page.

My HTML code: 

  & lt; A href = "# topofpage" class = "top" & gt; Return to the top of the page & lt; / A & gt;

My CSS code: 

  a.top (font-size: 40px;}

Try your CSS error 

  a.top {font-size: 40px;}

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