Day2/flex.html

<!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">
    <link rel="stylesheet" href="flex.css">
    <title>Flex</title>
</head>
<body>
    <div class="box-container">
        <div class="box"><h1>1</h1></div>
        <div class="box"><h1>2</h1></div>
        <div class="box"><h1>3</h1></div>
        <div class="box"><h1>4</h1></div>
    </div>
</body>
</html>