<link rel="stylesheet" href="//maxcdn.bootstrapcdn.com/bootstrap/latest/css/bootstrap.min.css">
<script src="//code.jquery.com/jquery.min.js"></script>
<script src="//maxcdn.bootstrapcdn.com/bootstrap/latest/js/bootstrap.min.js"></script>
<style>
span {
font-weight: bold;
font-size: 2em;
}
</style>
<span>일반</span>
<span class='text-muted'>뮤트</span>
<span class='text-primary'>중요</span>
<br>
<span class='text-success'>성공</span>
<span class='text-info'>정보</span>
<span class='text-warning'>경고</span>
<span class='text-danger'>위험</span>
