CSS Bug when cloning ROOT CSS rule from Bootstrap?

I’ve copied the root CSS from Bootstrap to make fundamental colour changes and I’m getting errors after that step:

Which results in that:

It’s not a good idea to customise Bootstrap like this. There are two recommended methods. There are probably umpteen articles about this, but I think this is a good place to start:

The first method mentioned is simpler but there are advantages in editing and recompiling SASS files.

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