Best way to size an element to the size of another element

Question

I am using an old CSS trick to get a semi-transparent background for some content, without the content appearing semi-transparent. Here is the HMTL:

        
                      

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Answer 1

Try taking position: absolute off of the contentFrame but leaving it on the opacityFrame. That should cause it's parent to resize, and the opacityFrame to still overlay everything.

Answer 2

do you have to use opacity? If it's a solid color, consider RGBA or if it's not solid, consider a semi-transparent PNG. That way you can nest them.