Select the first bracket and increase its font size (maybe to 36pt). You might also want to open the Font dialog and lower it by around 5pt to get it to align better. Do the same for the other bracket.

You will find the thickness of the line becomes very noticeable so you might want to either choose a more anaemic looking font for the bracket or perhaps change its colour to a somewhat lighter grey to reduce the heaviness.

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Andrew Lockton
Chrysalis Design, Melbourne Australia