ReStock Alerts automatically matches the “Notify me” button with your Shopify theme. However, there are times when you want to add some changes manually to better fit the button inside your pages. In order to do that, first, you need to be familiar with different types of “Notify me” widgets.
Inline “Notify me” button
This type of button is similar to the "Add to Cart" or "Sold Out" buttons. Out-of-stock products, collections, and home pages can all have this type of button. Look at the example below:
Inline “Notify me” form
This is the type of widget that is displayed as a signup form. This type of widget does not open a pop-up, and on the same page, the customer can register their request.
Float “Notify me” button
This type of button can be inserted everywhere on an out-of-stock product page (Right edge, Left edge, bottom-right, and bottom-left). you can also have it displayed alongside with Inline button and form.
this button can't be displayed on collections and home pages since having multiple buttons floating on a page doesn't look nice. right?:)