index.html

<!DOCTYPE html>
<html lang="en">
<head>
    <link href="https://fonts.googleapis.com/css2?family=Montserrat:wght@100;200;300;400;500;700&family=Open+Sans:wght@300&display=swap" rel="stylesheet">
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link rel="stylesheet" type="text/css" href="style.css">

    <title>Document</title>
</head>
<body>
<header>
   <h2>Lista de Supermercado</h2>    
</header>

<div class="lista-cadastro">
    
    <input type="text" placeholder="Nome do produto..." name="nome_produto">
    <input type="number" name="price" step="0.01">
    <input class="bt bt-vd" type="submit" name="acao" value="Cadastrar">
</div>

<div class="lista-produtos">
   
</div>

<div class="soma-produto">
    <h2>Total: R$0</h2>
</div>

<button class="bt bt-vm" name="limpar">Limpar</button>
    

<script src="supermercado.js"></script>
</body>
</html>