huong-dan.html

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    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Hướng dẫn cài đặt chữ ký gmail - MEC International</title>
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        body {
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        iframe {
            width: 100vw;
            height: 100vh;
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<body>
    <div>
        <iframe
            src="https://docs.google.com/viewer?embedded=true&url=https://luuhai48.github.io/file/MEC-Gmail signature.pptx"></iframe>
    </div>
</body>

</html>