bootrap

div class="container"> <div class="row"> <div class="col-md-4 col-lg-offset-4"> <form style="background-color: #08f080;margin-top:200px;text-align: center"> <fieldset style="width: 70% ;margin: auto"> <h1>User Login</h1>   <div class="input-group form-group"> <span class="input-group-addon"> <span class="glyphicon glyphicon-user"></span> </span> <input class="form-control" type="text"> </div>   <div class="form-group"> <div class="input-group"> <span class="input-group-addon"> <span class="glyphicon glyphicon-lock"></span> </span> <input class="form-control" type="password"> </div> </div>   <div class="form-group"> <div class="input-group"> <input class="form-control" type="text"> <span class="input-group-addon">@</span> </div> </div> <div class="form-group input-group"> <input type="text" class="form-control"> <span class="input-group-btn"> <button class="btn btn-default">GO!</button> </span> </div>         <div class="form-group input-group"> <div class="input-group-btn"> <button class="btn btn-default"> button <span class="caret"></span> </button> <ul class="dropdown-menu"> <li><a>菜单1</a></li> <li><a>菜单1</a></li> <li class="divider"></li> <li><a>菜单1</a></li> <li><a>菜单1</a></li> </ul> <input type="text" class="form-control"/> </div>   </div>     <div class="form-group input-group"> <div class="input-group-btn open"> <button type="button" class="btn btn-default">action</button> <button type="button" class="btn btn-default dropdown-toggle"> <span class="caret"></span> </button> <ul class="dropdown-menu"> <li><a>adfasd</a></li> <li><a>adfasd</a></li> <li><a>adfasd</a></li> <li><a>adfasd</a></li> </ul> </div>   <input type="text" class="form-control"/> </div>       <a href="#"class="btn btn-info btn-block" >登陆</a> <a href="#"class="btn btn-info btn-block" >重置</a>   </fieldset>   </form> </div> </div> </div>   <div class="input-group"> <input type="text" class="form-control" /> <div class="input-group-btn open"> <button class="btn btn-default dropdown-toggle"> button <span class="caret"></span> </button> <ul class="dropdown-menu"> <li><a>菜单1</a></li> <li><a>菜单1</a></li> <li class="divider"></li> <li><a>菜单1</a></li> <li><a>菜单1</a></li> </ul> </div> </div> <br/> <br/> <br/>   <ul class="nav nav-tabs "> <li class="active"><ahref="#">aaaa</a></li> <li><ahref="#">aaaa</a></li> <li class="open"> <a href="#"class="dropdown-toggle"> aaa<span class="caret"></span> </a> <ul class="dropdown-menu"> <li ><ahref="#">adf</a></li> <li ><ahref="#">adf</a></li> <li ><ahref="#">adf</a></li> <li ><ahref="#">adf</a></li> </ul> </li> </ul>   </body>