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Where to add custom CSS?

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Every Divi page has a custom CSS section in the settings.
  1. 1.
    Open a page with the Divi Builder
  2. 2.
    Go to Advanced settings as shown in the image below
  3. 3.
    Add CSS

CSS not working?

Try adding !important behind it.
.df-activebutton {
filter: brightness(50%) !important;
}