<button class="mui-btn">Badge button <span class="mui-badge">1</span></button>
<button class="mui-btn mui-btn-primary">Badge button <span class="mui-badge mui-badge-primary">1</span></button>
<button class="mui-btn mui-btn-positive">Badge button <span class="mui-badge mui-badge-positive">1</span></button>
<button class="mui-btn mui-btn-negative">Badge button <span class="mui-badge mui-badge-negative">1</span></button>

<button class="mui-btn mui-btn-outlined">Badge button <span class="mui-badge mui-badge-inverted">1</span></button>
<button class="mui-btn mui-btn-outlined mui-btn-primary">Badge button 
<span class="mui-badge mui-badge-primary mui-badge-inverted">1</span></button>
<button class="mui-btn mui-btn-outlined mui-btn-positive">Badge button 
<span class="mui-badge mui-badge-positive mui-badge-inverted">1</span></button>
<button class="mui-btn mui-btn-outlined mui-btn-negative">Badge button 
<span class="mui-badge mui-badge-negative mui-badge-inverted">1</span></button>