부트 스트랩 이미지 - 미리보기 이미지

.img-thumbnail클래스는 축소판 이미지를 모양 :

예
<img src="cinqueterre.jpg" class="img-thumbnail" alt="Cinque Terre" width="304" height="236">

<!DOCTYPE html>
<html lang="en">
<head>
<title>Bootstrap Example</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
</head>
<body>

<div class="container">
<h2>Thumbnail</h2>
<p>The .img-thumbnail class creates a thumbnail of the image:</p>
<img src="cinqueterre.jpg" class="img-thumbnail" alt="Cinque Terre" width="304" height="236">
</div>

</body>
</html>