Is there a limit to font weights?

Hi, I have set the header front on my page to the following but it does not seem to change the weight of the font used in the headr text on my home page. Have I missed something obvious?


Hello there,

By default, headings size are set to 300. To change it 900 try adding this CSS code to Appearance > Customize > Additional CSS from dashboard.

    h1, h2, h3, h4, h5, h6 {
      font-weight: 900;

Or use this one for re-style the main header heading.

    .header-text {
      font-weight: 900;


Funny enough, that is precisely what I did to workaround this. Thanks