Main heading: 
Use the Heading 1 style for primary headings so that screen readers can identify them as such. 

If not already, manually change your heading 1 style to be: 

 - sans serif (e.g. Arial, Verdana, Trebuchet or Calibri), 

 - 16 pt, and 

 - Bold

Then set this formatting as your default for this style.
<div style="display: none;"> </div>