<button type="button" class="c-btn-outline">デフォルト</button>
<button type="button" class="c-btn-outline c-btn-outline--primary">普通</button>
<button type="button" class="c-btn-outline c-btn-outline--success">更新</button>
<button type="button" class="c-btn-outline c-btn-outline--info">案内</button>
<button type="button" class="c-btn-outline c-btn-outline--warning">注意</button>
<button type="button" class="c-btn-outline c-btn-outline--danger">危険</button>

<a href="#" class="c-btn-outline">デフォルト</a>
<a href="#" class="c-btn-outline c-btn-outline--primary">普通</a>
<a href="#" class="c-btn-outline c-btn-outline--success">更新</a>
<a href="#" class="c-btn-outline c-btn-outline--info">案内</a>
<a href="#" class="c-btn-outline c-btn-outline--warning">注意</a>
<a href="#" class="c-btn-outline c-btn-outline--danger">危険</a>