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This menu item has a page class "own"

You can user custom CSS (user.css) to change things. For example the colours. Cassiopeia uses some custom css properties (variables). The background of header and footer are using these variables.

You can re-define the variables for a specific HTML element or a class. If you write following css code in your user.css file, you will change the colours on the page with the class "own".

.own {
  --cassiopeia-color-primary: #2F9C95;
  --cassiopeia-color-hover: #174F4B;
  --cassiopeia-color-link: #1C5E5A;
}