How can I modify the 'Add to cart' button in my online store?

[ALTAYLISHOP]

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"max-width": "calc(25% - 20px)",
"margin-left": "20px",
"margin-bottom": "50px"
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"button": "Add to cart"
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"max-width": "100%",
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"button": "Add to cart"
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"option": {},
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"total": "Subtotal",
"button": "Checkout"
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