Chris H. yeah it looks like you may have retrofitted the style guide into this project instead of simply cloning the webflow style guide. It looks like the custom code that we would have in this style guide is not in there.
Being that you are what appears to be early into the project, I would highly recommend cloning the style guide and starting over which I'm sure is not what you want to hear but you'll run into quite a few issues if you don't. Way more headache than starting over.
It also appears as though the "Global Styles" component has been deleted as well which has a whole other set of custom CSS as well.
Here is the custom CSS that should be in the <head> in Webflow site settings > custom code
<!-- Keep this css code to improve the font quality-->
<style>
* {
-webkit-font-smoothing: antialiased;
-moz-osx-font-smoothing: grayscale;
-o-font-smoothing: antialiased;
-webkit-appearance:none;
}
</style>
