html container

<!DOCTYPE html>
<html lang="ru">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Блочная модель документа</title>
    <link rel="stylesheet" href="css/style.css">
</head>
<body>
    <div class="container">
        <div class="red">a</div>
        <div class="green">b</div>
        <div class="blue">c</div>
        <div class="yellow">d</div>
        <div class="black">f</div>
    </div>
</body>
</html>