Solution to dot (.) in CSS selector

Anyone familiar with CSS knows that the dot (.) is used to mark the class selector. If you use it directly:

# Ribbon.Documents.EditCheckout{
}

is impossible to work as a selector.

Then the question is, how to use the id of the above element as a css selector? The solution is to use "escape characters", similar to the following:

# Ribbon\.Documents\.EditCheckout{
}

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