How to design the Notify Me button?

Go to Settings >> Button Style >> Click on Customize button.

Modal/Pop-up:- Select the position to display button.

From Top:- Drag the point to set top margin of button.

Button Text:- You can set any text for button as per your wish. i.e. Notify Me, Email me when available.

Background color/ Text color:- Set background color and text color for button.

Border Radius:- Drag the point to change border radius of button. (It determines how much the corners of an element are rounded).

Hovering button color/ Text color:- You can set different background & text color when customer hover over the button.

Display for all:- Enable checkbox if you want to show Notify me button for all variants even if there's only one variant out of stock.

Customize Inline button position:- It is used to change the button position. Check this document for more information:- click here

Once you customize the button then click on save button to save the changes.