<div class="container">
<div class="input-group">
<input type="text" class="form-control input-lg"><span class="input-group-addon btn btn-primary">搜索</span>
</div>
</div>
<div class="container">
<div class="input-group">
<input type="text" class="form-control input-lg"><span class="input-group-addon btn btn-primary">搜索</span>
</div>
</div>
原文：https://www.cnblogs.com/xiadongqing/p/8605822.html