grid system

hello
hello
hello
hello
hello
hello
Hello, world!

grid system

hello
hello
hello
hello
hello
hello
Hello, world!

grid system

hello
hello
hello
hello
hello
hello
<!doctype html>
<html lang="ko">

<head>
    <!-- Required meta tags -->
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">

    <!-- Bootstrap CSS -->
    <link href="<https://cdn.jsdelivr.net/npm/[email protected]/dist/css/bootstrap.min.css>" rel="stylesheet">

    <title>Hello, world!</title>
    <style>
        .border{
            border: solid 1px black;
        }
    </style>
</head>

<body>
    <h1>grid system</h1>
    <div class="container">
        <div class="row">
            <div class="col-md-6 col-md-6 border">hello</div>
            <div class="col-md-3 col-md-6 border">hello</div>
            <div class="col-md-3 col-md-6 border">hello</div>
        </div>
        <div class="row">
            <div class="col-md-4 border">hello</div>
            <div class="col-md-4 border">hello</div>
            <div class="col-md-4 border">hello</div>
        </div>
        <div class="row">
            <div class="col-md-4 offset-md-4 border">hello</div>
            <div class="col-md-4 border">hello</div>
        </div>
    </div>

    <!-- JavaScript -->
    <script src="<https://cdn.jsdelivr.net/npm/[email protected]/dist/js/bootstrap.bundle.min.js>"></script>
</body>

</html>