<!DOCTYPE html>
<html lang="en">
<head>
  <title>Ví dụ hình ảnh trong Bootstrap 4</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css">
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.3/umd/popper.min.js"></script>
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.1.3/js/bootstrap.min.js"></script>
</head>
<body>
 
<div class="container">
<h3>Hình ảnh có 4 góc bo tròn với lớp .rounded</h3>
<div class="row"> 
    <div class="col-lg-4 col-md-4">
        <img src="https://cdn.24h.com.vn/upload/2-2019/images/2019-05-16/1557972793-639-ksdc-1557914095-width650height818.jpg" class="rounded" alt="A girl" width="300">
    </div>
</div>
</div>
</body>
</html>

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