下拉菜单变形，如何将其恢复横向显示？变成视频中演示的这种样式：我的源代码是：<!DOCTYPE html><html> <head> <meta charset="utf-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no"> <title>2-7</title> <!-- Bootstrap --> <link href="css/bootstrap.css" rel="stylesheet"> <link href="css/layout.css" rel="stylesheet"> <link href="css/css.css" rel="stylesheet"> </head> <body> <!-- header --> <section id="page-head"> <nav class="navbar navbar-default"> <div class="container-fluid"> <div class="navbar-header"> <a class="navbar-brand" href="#"> <img alt="Brand" src="../素材/logo.png"> </a> </div> <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1" aria-expanded="false"> <span class="sr-only">Toggle navigation</span> <span class="icon-bar"></span> <span class="icon-bar"></span> <span class="icon-bar"></span> </button> <!-- Collect the nav links, forms, and other content for toggling --> <div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1"> <ul class="nav navbar-nav"> <li class="active"><a href="#">首页 <span class="sr-only">(current)</span></a></li> <li class="dropdown"> <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">生日 <span class="caret"></span></a> <ul class="dropdown-menu"> <li><a href="#">Action</a></li> <li><a href="#">Another action</a></li> <li><a href="#">Something else here</a></li> <li role="separator" class="divider"></li> <li><a href="#">Separated link</a></li> <li role="separator" class="divider"></li> <li><a href="#">One more separated link</a></li> </ul> </li> <li class="dropdown"> <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">婚礼 <span class="caret"></span></a> <ul class="dropdown-menu"> <li><a href="#">Action</a></li> <li><a href="#">Another action</a></li> <li><a href="#">Something else here</a></li> <li role="separator" class="divider"></li> <li><a href="#">Separated link</a></li> <li role="separator" class="divider"></li> <li><a href="#">One more separated link</a></li> </ul> </li> <li class="dropdown"> <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">专用 <span class="caret"></span></a> <ul class="dropdown-menu"> <li><a href="#">Action</a></li> <li><a href="#">Another action</a></li> <li><a href="#">Something else here</a></li> <li role="separator" class="divider"></li> <li><a href="#">Separated link</a></li> <li role="separator" class="divider"></li> <li><a href="#">One more separated link</a></li> </ul> </li> <li class="dropdown"> <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">商铺 <span class="caret"></span></a> <ul class="dropdown-menu"> <li><a href="#">Action</a></li> <li><a href="#">Another action</a></li> <li><a href="#">Something else here</a></li> <li role="separator" class="divider"></li> <li><a href="#">Separated link</a></li> <li role="separator" class="divider"></li> <li><a href="#">One more separated link</a></li> </ul> </li> </ul> </div><!-- /.navbar-collapse --> <div class="head-msg"> <span class="glyphicon glyphicon-search" aria-hidden="true"></span> <span class="glyphicon glyphicon-user" aria-hidden="true"></span> <span class="glyphicon glyphicon-shopping-cart" aria-hidden="true"></span> </div> </div> </nav> </section> <!-- header --> <script src="js/jquery-3.4.1.min.js"></script> <script src="js/bootstrap.js"></script> </body></html>layout.css里的样式是：@charset "utf-8";.head-msg{ float: right; height: 50px; line-height: 50px; text-align: center;}.head-msg > span{ width: 45px; color: #FFFFFF;}.navbar-default{ background: #5d4b33; border: none; border-radius: 0;}.navbar-header,.navbar-toggle{ float: left;}.navbar-default .navbar-toggle .icon-bar{ background-color: #fff;}.navbar-default .navbar-toggle{ background-color: #f0781a;}.navbar-brand img{ margin-top: -8px;}.container-fluid > .navbar-collapse{ float: left;}
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