부트스트랩 글리피콘
<link rel="stylesheet" href="//netdna.bootstrapcdn.com/bootstrap/3.0.0/css/bootstrap-glyphicons.css">
글리피콘-사용자 부트스트랩 4
<button type="button" class="btn btn-default navbar-btn">Sign in</button>
부트 스트랩 4 의 글리피콘
<div class="panel panel-primary">...</div>
<div class="panel panel-success">...</div>
<div class="panel panel-info">...</div>
<div class="panel panel-warning">...</div>
<div class="panel panel-danger">...</div>