CSSEx v0.8.0

CSSEx.Helpers.Functions.opacity

You're seeing just the function opacity, go back to CSSEx.Helpers.Functions module for more information.
Link to this function

opacity(ctx_content, color, alpha)

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Opacity function, takes a color in the form of a string and a number representing the desired alpha channel value in the form of a float and returns a CSS rgba() string.

@fn::opacity(orange, 0.5)