Theme specific globalStyle

[sbolinger-godaddy]

I want to scope all globalStyles to the parent class of my theme. Right now I do it this way:

globalStyle(`${themeClass} h1, ${themeClass} h2, ${themeClass} h3, ${themeClass} h4`, {
  marginBottom: '10px',
});

It's really verbose to manually add my theme class to each selector, it would be nice if there was a globalThemeStyle function for this purpose.