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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Matching Parentheses
Date: Sat, 03 Oct 2020 14:29:55 +0300
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 (message from Christopher Dimech on Sat, 3 Oct 2020 12:39:33 +0200)
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> From: Christopher Dimech <dimech@gmx.com>
> Date: Sat, 3 Oct 2020 12:39:33 +0200
> 
> (set-face-background 'show-paren-match (face-background 'default))
> (set-face-foreground 'show-paren-match "#def")
> (set-face-attribute 'show-paren-match nil :weight 'extra-bold)

This is wrong: show-paren-mode shows the parentheses with a different
background color, and you here set the background to the default one,
thus effectively disabling the feature.

Find a background color that makes the parentheses look prominently,
and change only the background of the show-paren-match face.  Leave
all the other attributes of the show-paren-match face unspecified.