<!DOCTYPE html>
<head>
    <!-- Webiste font-size changes when screen size changes. -->
    <meta name="viewport" content="width=device-width, initial-scale=1.0">

    <!-- Inlude css file -->
    <link rel="stylesheet" type="text/css" href="bootstrap.css" >
    <link rel="stylesheet" type="text/css" href="style.css" >
    <title>This is Ck editor</title>
</head>
<body>
    
    <!-- Include Javascript File -->
    <script src="jquery.js" ></script>
    <script src="bootstrap.js" ></script>
    <script src="ckeditor.js" ></script>
    <script>
        CKEDITOR.replace( 'ckeditor-4' );
    </script>
</body>