<html>
<head>
<link rel = stylesheet href = https://cdnjs.cloudflare.com/ajax/libs/bttn.css/0.2.4/bttn.css>
</head>
<body>
<button class = bttn-pill bttn-lg>大按钮</button>
<button class = bttn-pill bttn-md>中按钮</button>
<button class = bttn-pill bttn-sm>小按钮</button>
<button class = bttn-pill bttn-xs>扩展小按钮</button>
</body>
</html>
