<div class="btn-toolbar">
    <div class="btn-group">
        <button type="button" class="btn btn-default">Left</button>
        <button type="button" class="btn btn-default">Middle</button>
    </div>
    <div class="btn-group">
        <button type="button" class="btn btn-default">Right</button>
    </div>
    <div class="btn-group">
        <button type="button" class="btn btn-default dropdown-toggle" data-toggle="dropdown">
            Dropdown
            <span class="caret"></span>
        </button>
        <ul class="dropdown-menu">
            <li><a href="#">Dropdown link</a></li>
            <li><a href="#">Dropdown link</a></li>
        </ul>
    </div>
</div>

i input-group input-group-addon form-control form-inline form-horizontal ### 颜色和对齐方式

.text-muted{color:#999}.text-primary{color:#428bca}.text-warning{color:#c09853}.text-danger{color:#b94a48}.text-success{color:#468847}.text-info{color:#3a87ad}.text-left{text-align:left}.text-right{text-align:right}.text-center{text-align:center}