我使用引导和css在angular中创建了一个响应表单，但我无法在其中设置submit按钮的宽度

我正在使用引导和css在angular中创建一个响应表单，但是 当它在移动设备上运行时，汉堡会与其他内容重叠 （注册并签名）

下面的代码用于导航栏-：

app.component.html

：~

<nav class="navbar">
  <div class="container-fluid">
    <div class="navbar-header">
      <button type="button" class="navbar-toggle" data-toggle="collapse" data- target="#nav">
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
      </button>
      <a class="navbar-brand" href="#">pink scissor</a>
    </div>
    <div class="collapse navbar-collapse" id="nav">
      <ul class="nav navbar-nav navbar-right">
        <li><a href="#">Home</a></li>
        <li><a href="#">Page 1</a></li>
        <li><a routerLink="/signup">sign up</a></li>
        <li><a routerLink="/signin">sign in</a></li>
      </ul>
    </div>
  </div>
</nav>
<router-outlet></router-outlet>

<div class="container-fluid hail">
  <span>
    <h5>welcome to </h5>
    <h1>pink seccior</h1>
    <p>
      log in to get the moment updates of the things
      <br>
      that interest you
    </p>
  </span>

  <form action="">
    <div class="form-group">
      <input type="text" class="form-control" name="" id="name" placeholder="name">
    </div>
    <div class="form-group">
      <input type="email" class="form-control" id="email" placeholder="email">
    </div>
    <div class="form-group">
      <input type="password" class="form-control" id="pwd" placeholder="password">
    </div>
    <button type="submit">submit</button>

    <span>already have a account ?
      <a routerLink="/signin">sign in</a>
    </span>
  </form>
</div>

我想当我点击汉堡包图标时，它会将表单向下移动，但它与表单重叠