我正在为我的学校俱乐部（巴西）制作一个网站，我想知道如何在我的移动网站上解决这个问题。按下时移动中的三行不执行任何操作。
<html>
<head>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta/css/bootstrap.min.css" integrity="sha384-/Y6pD6FV/Vv2HJnA6t+vslU6fwYXjCFtcEpHbNJ0lyAFsXTsjBbfaDjzALeQsN6M" crossorigin="anonymous">
<title>ClubeDiversidade</title>
</head>
<style>
body {
background-color: orange;
}
</style>
<body>
<nav class="navbar navbar-expand-lg navbar-light bg-light">
<a class="navbar-brand" href="#">Clube da diversidade</a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNavDropdown" aria-controls="navbarNavDropdown" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarNavDropdown">
<ul class="navbar-nav">
<li class="nav-item active">
<a class="nav-link" href="#">Pagina inicial <span class="sr-only">(current)</span></a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Inscrição</a>
</li>
<li class="nav-item">
<a class="nav-link" href="sobrenatural.html">Sobrenatural</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Tecnologia</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Outras atividades</a> …