style.html

<!DOCTYPE html>
<html>

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <title>Style</title>
    <style>
        #quadrado {
            width: 100px;
            height: 100px;
            background-color: azure;
        }
    </style>
</head>

<body>
    <p style="color: firebrick">Lorem ipsum dolor sit amet consectetur, adipisicing elit. Cumque dolorem voluptas deleniti rerum suscipit voluptatibus sit saepe illo odio iste, id autem neque nihil! Consequatur perferendis explicabo minima voluptates nesciunt.</p>
</body>

</html>