html-css/rem-unit.html at main · dm-thedeveloper/html-css · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<style>
    html{
        font-size: 20px;
    }

    /* h1{
        font-size: 3rem;
    }
    p{
        font-size: 1.5rem;
    } */

   div{
    height: 10rem;
    width: 20rem;
    background: #000;
   }

   @media (max-width: 600px) {
  html {
    font-size: 10px; /* Now all rems adjust! */
  }
}
</style>
<body>
<!--
    <h1>Lorem ipsum dolor sit amet.</h1>
    <p>Lorem ipsum dolor, sit amet consectetur adipisicing elit. Hic, odio eos! Provident enim, impedit repudiandae odio laboriosam ut velit debitis pariatur sunt odit aspernatur? Soluta nobis voluptatem quisquam esse dolorem.</p>
     -->

     <div class=""></div>
</body>
</html>