Trying to make call us button bold

I am trying to make the call to action button on the header bold.

It is located under Customizing > Header Area > Header text > Button Text

Tried looking for it but can’t seem to find anything.

Hello there,

Try adding this CSS code to Appearance > Customize > Additional CSS from dashboard.

    .header-button {
      font-weight: bold;
      font-size: 18px;