title: Kendo-Grid-Column header font size
body: <p>how to change the font size of Kendo-Grid-Column header in html?</p>
  
  <p>By default it's very big and I tried to add font-size:medium; to the column style but still not working.</p>
  
  <p>I tried [headerStyle] as the following <a href="https://www.telerik.com/kendo-angular-ui/components/grid/styling/" rel="nofollow noreferrer">link</a></p>
  
  <p>I got this error: Can't bind to 'headerStyle' since it isn't a known property of 'kendo-grid'.</p>