Preview:
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>CSS Specificity</title>
    <link rel="stylesheet" href="style.css">
</head>
<body>
    <div class="container">
        <div id="main">
            <p>
                <a href="#">Link here</a>
            </p>
        </div>
    </div>
</body>
</html>

a {
    color: black;
}

p a {
    color: purple;
}

div #main p a {
    color: yellow;
}

#main a {
    color: blue;
}

.container #main a {
    color: red;
}
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