       可以通过添加<code>.dim</code>class来使用3D按钮.
                    </p>
                    <h3 class="font-bold">3D按钮</h3>

                    <button class="btn btn-primary dim btn-large-dim" type="button"><i class="fa fa-money"></i>
                    </button>
                    <button class="btn btn-warning dim btn-large-dim" type="button"><i class="fa fa-warning"></i>
                    </button>
                    <button class="btn btn-danger  dim btn-large-dim" 