Button

<button class="btn btn-primary">Primary</button>
<button class="btn btn-secondary">Secondary</button>
<button class="btn btn-dark">Dark</button>
                

Primary Secondary Dark Light Red Green Orange Yellow Gray Purple Pink

<button type="submit" class="btn btn-primary icon-btn"><i class="fas fa-arrow-alt-circle-up"></i><span class="badge">12</span></button>
<button class="btn btn-secondary icon-btn"><i class="fas fa-arrow-alt-circle-down"></i><span class="badge">100</span></button>
<button class="btn btn-dark icon-btn"><i class="fas fa-arrow-alt-circle-left"></i><span class="badge">1000</span></button>

12 100 1000 4 42 40 104 4000 40000 234 45

<button class="btn btn-primary btn-large">Primary</button>
<button class="btn btn-secondary btn-large">Secondary</button>
<button class="btn btn-dark btn-large">Dark</button>
                

Primary Secondary Dark Light Red Green Orange Yellow Gray Purple Pink

<button type="submit" class="btn btn-primary btn-large"><i class="fas fa-arrow-alt-circle-up"></i>Primary</button>
<button class="btn btn-secondary btn-large"><i class="fas fa-arrow-alt-circle-down"></i>Secondary</button>
<button class="btn btn-dark btn-large"><i class="fas fa-arrow-alt-circle-left"></i>Dark</button>
             

Primary Secondary Dark Light Red Green Orange Yellow Gray Purple Pink