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4.14 Option for fringe visibility

Brief: Control the overall coloration of the fringes.

Symbol: modus-themes-fringes (‘choice’ type)

Possible values:

1. nil
2. subtle
3. intense

When the value is nil, do not apply a distinct background color.

With a value of subtle use a gray background color that is visible yet close to the main background color.

With intense use a more pronounced gray background color.