Change colors/theme runtime

[subpublic]

Summary

Maybe this is possible, but I cant figure out.
I want to be able to change the primary colors using a config at load/runtime.

Basic example

theme.colors.override = {
  backgroundColor: '#ffdddd',
  primary: '#cccccc'
}

Motivation

I'm developing a SaaS service, where my customers want to white label and customize the look and feel of their page.
They can use custom domains or customer.mysaas.com, and set their own colors, font, etc.

Could be done something like Material UI createTheme
https://mui.com/material-ui/customization/theming/

[subpublic]

Maybe if the css would use the variables consistently, one could override --color-theme-1, or set with javascript, but seems to be rendered in build time somehow.