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You can find the Selector by inspecting element (right-click in your storefront, select "Inspect Element", and then use the pointer to on the Add to cart button). Search for the button class, and discard classes like "btn". If you have no idea, have a look at some popular theme's below.
Each theme has its own CSS Selector for the Add to Cart button. Note that the
# or anything in front of the words is very important to have a valid selector. Here's a list of some examples:
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