Brief: Control the style of matching delimiters produced by
show-paren-mode.
Symbol: modus-themes-paren-match (‘choice’ type, list of properties)
Possible values are expressed as a list of properties (default is nil or
an empty list). The list can include any of the following symbols:
bold
intense
underline
The default (a nil value or an empty list) is a subtle background color.
The bold property adds a bold weight to the characters of the matching
delimiters.
The intense property applies a more prominent background color to the
delimiters.
The underline property draws a straight line under the affected text.
Combinations of any of those properties are expressed as a list, like in these examples:
(bold) (underline intense) (bold intense underline)
The order in which the properties are set is not significant.
In user configuration files the form may look like this:
(setq modus-themes-paren-match '(bold intense))
This customization variable affects the built-in show-paren-mode and the
‘smartparens’ package.