23_clear.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Clear property</title>
    <link rel="stylesheet" href="style/style23.css">
</head>
<body>
    <div class="box">
        <div class="leftsidebar">leftsidebar</div>
        <div class="rightsidebar">rightsidebar</div>
        <div class="footer">footer</div>
    </div>
</body>
</html>