Update README.md

Author: Onatcer

README.md

@@ -78,6 +78,17 @@ Configures what state of the toggle button should be shown to the user.
 -   `currentState` - Shows the state that is currently applied to the website.
 -   `newState` - Shows the state that will be applied when the user clicks the button.
 
+## Customize Dark Mode
+
+You can exclude elements from being inverted in dark mode using the `.nightowl-daylight` CSS class. Just add it to an element and it will show the element in the same way as the light mode. 
+
+```html
+<div>
+  <p>I'm inverted in Dark Mode</p>
+  <p class="nightowl-daylight">I'm not inverted in Dark Mode</p>
+</div>
+```
+
 ## Contribution Guidelines
 
 Please open an issue and wait for one of the Maintainers to approve it until you open a merge request.