1. Log in to the panel https://panel.callback24.io/ with your credentials.

2. Go to the Settings -> Services, click on your service or Add New and go to Advanced Settings.

3. Click on the arrow at the bottom of the Custom CSS page.
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4. Enter the code to change the appearance of the pop-up. You can change the color, background, and font.

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5. After filling in the field, select the Save button.