Container to take remaining width of parent

I’m trying to do something but I’m struggling to do it with the default tools, I don’t know it it is possible.

If we have a parent container, let’s call it “Master”, with two more containers inside, one with a fixed width of 100px “Fixed” and one with variable width “Variable”. Now, “Master” can go from a fixed width (1004px) to full screen on a click, when this happens, I want “Variable” to fill up the extra width created by “Master”, but “Fixed” needs to remain it’s original width of 100px so that:
“Fixed” width + “Variable” width = “Master” width

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