Scroll Behavior Smooth Function With Html & Css

<!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>Document</title>
    <style>
        html
        {
            scroll-behavior: smooth;
        }
        #section1
        {
            height: 800px;
            width: 100%;
            background-color: pink;
        }
        #section2
        {
            height: 800px;
            width: 100%;
            background-color: yellow;
        }
        *
        {
            padding: 0px;
            margin: 0px;
        }
        h2
        {
            text-align: center;
        }
    </style>
   </head>
   <body>
    <h2>Scroll behavior</h2>
    <div id="section1">
        <h1>section 1</h1>
        <a href="#section2">click to calibrate next page</a>
    </div>
    <div id="section2">
        <h1>section 2</h1>
        <a href="#section1">click to calibrate next page</a>
    </div>    
   </body>
   </html>