<i class="fa fa-camera-retro"></i> [normal]
<i class="fa fa-camera-retro fa-lg"></i> fa-lg
<i class="fa fa-camera-retro fa-2x"></i> fa-2x
<i class="fa fa-camera-retro fa-3x"></i> fa-3x
<i class="fa fa-camera-retro fa-4x"></i> fa-4x
<i class="fa fa-camera-retro fa-5x"></i> fa-5x
<ul class="fa-ul">
<li><i class="fa-li fa fa-check-square"></i>List icons</li>
<li><i class="fa-li fa fa-check-square"></i>can be used</li>
<li><i class="fa-li fa fa-spinner fa-spin"></i>as bullets</li>
<li><i class="fa-li fa fa-square"></i>in lists</li>
</ul>
<i class="fa fa-3x fa-spinner fa-spin"></i>
<i class="fa fa-3x fa-circle-o-notch fa-spin"></i>
<i class="fa fa-3x fa-refresh fa-spin"></i>
<i class="fa fa-3x fa-cog fa-spin"></i>
<i class="fa fa-3x fa-spinner fa-pulse"></i>
<button class="btn btn-danger">
<i class="fa fa-trash-o fa-lg"></i> Delete
</button>
<button class="btn btn-primary btn-sm">
<i class="fa fa-cog"></i> Settings
</button>
<div class="btn-group">
<a class="btn btn-default" href="#"><i class="fa fa-align-left"></i></a>
<a class="btn btn-default" href="#"><i class="fa fa-align-center"></i></a>
<a class="btn btn-default" href="#"><i class="fa fa-align-right"></i></a>
<a class="btn btn-default" href="#"><i class="fa fa-align-justify"></i></a>
</div>
<div class="input-group form-group">
<span class="input-group-addon"><i class="fa fa-envelope-o fa-fw"></i></span>
<input class="form-control" type="text" placeholder="Email address">
</div>
<div class="input-group form-group">
<span class="input-group-addon"><i class="fa fa-key fa-fw"></i></span>
<input class="form-control" type="password" placeholder="Password">
</div>