Live Demo: Reset/Remove CSS Styles for Element

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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Reset/Remove CSS Styles for Element</title>
<style>
    /* Some custom styling */
    body {
        color: red;
        font-size: 18px;
    }
    .container {
        padding: 20px;
        border: 1px solid black;
    }
    h1 {
        color: white;
        background: black;
    }
    p {
        font-style: italic;
    }
​
    /* Revert CSS style of target element and its children */
    .reset-style, .reset-style * {
        all: revert;
    }
</style>
</head>
<body>
    <div class="container reset-style">
        <h1>This is a heading</h1>
        <p>This is a simple paragraph of text.</p>
    </div>
​
    <div><strong>Note:</strong> Add/Remove "reset-style" class on container div to see how it basically works.</div>
</body>
</html>