Please See:
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product.js: - lines 1 to 18 - lines 103 to 109 - lines 229 to 235
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style.css: - lines 120 to 133
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checkout.js: - lines 29 to 31
Note: You can use the EXACT same code in your admin.js as was added in the checkout.js The only difference will be that, instead of using: "let checkoutList = JSON.parse( localStorage.getItem('checkout items') )" Use: "let checkoutList = JSON.parse( localStorage.getItem('products') )"