The below steps will show you how to change the button colour within your Email Notifications.

• Step 1: From the Admin Homepage, click on Tools>Notifications>Email Templates:

• Step 2: Choose a template from the drop-down, and then select Source:

• Step 3: Using your keyboard, press ctrl + F and enter background-color: #479cff into the search bar. This will take you to the area in the Source Code that contains the default Hex code for the button.
• Step 4: Enter in the Hex code, and click Save to update your changes.