If you want to change the color of the 'Leave a review' button on your Shopify app you can follow these steps:
1. Head over to the 'Widget' page, and on the left-hand side menu, you will scroll down until you see Custom CSS field:
2. Input the following custom CSS:
background-color:#Hex color code;
Note: In the #Hex color code add your desired color.
Click 'Preview' to test out the button.
3. If the color fits your website, please click the 'Save' button in the top-right corner to save the changes and apply them live:
If you need any additional assistance in changing the color, feel free to hit the bubble chat and reach our Customer Success team, or feel free to email us at: firstname.lastname@example.org