用Bootstrap创建一个小按钮组
要在Bootstrap中创建大按钮组，请使用.btn-group-sm类。
示例
<!DOCTYPE html>
<html>
<head>
<title>Bootstrap Example</title>
<link rel = "stylesheet" href = "https://maxcdn.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css">
<script src = "https://cdn.staticfile.org/jquery/3.3.1/jquery.min.js"></script>
<script src = "https://maxcdn.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js"></script>
</head>
<body>
<p>The following are the car brands:</p>
<div class = "btn-group-justified">
<button type = "button" class = "btn btn-default">BMW</button>
<button type = "button" class = "btn btn-default">Audi</button>
<button type = "button" class = "btn btn-default">Jeep</button>
<button type = "button" class = "btn btn-default">Datsun</button>
<button type = "button" class = "btn btn-default">Toyota</button>
</div>
<p>The following are FMCG:</p>
<div class = "btn-group-justified btn-group-sm">
<button type = "button" class = "btn btn-default">ITC Limited</button>
<button type = "button" class = "btn btn-default">Colgate-Palmolive</button>
<button type = "button" class = "btn btn-default">Nestle</button>
<button type = "button" class = "btn btn-default">Britannia Industries Limited</button>
</div>
</body>
</html>