Which file does the CMS Boilerplate use to apply the styles set in the theme's settings?

In the HubSpot CMS Boilerplate, theme setting values are applied through the stylesheet intended for theme-level overrides rather than the base stylesheet. HubSpot’s theme walkthrough specifically instructs developers to open that file and reference values from the theme object, such as {{ theme.footer.height }}, so updates made in theme settings change the rendered styles. HubSpot’s boilerplate example also shows the base template requiring main.css first and then the overrides stylesheet afterward, which makes that later file the layer for configurable theme styling. That separation keeps foundational CSS in one file and theme-editor-driven styling in another. HubSpot Developers+1