javascript – On mobile resolutions, when the drop-down menu is called, a scroll appears – how to fix it?

Question:

There is a two-level menu with a dropdown submenu on bootstrap . On mobile, when the menu collapses into a sandwich, the bottom dropdowns do not fit into the menu area and a scroll appears on the right side of it. How can this moment be corrected? feedl

.dropdown:hover > .dropdown-menu {
  display: block;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="http://netdna.bootstrapcdn.com/bootstrap/3.0.2/js/bootstrap.js"></script>
<link href="http://netdna.bootstrapcdn.com/bootstrap/3.0.2/css/bootstrap.css">
<nav class="navbar navbar-default navbar-static">
  <div class="container-fluid">
    <div class="navbar-header">
      <button class="navbar-toggle collapsed" type="button" data-toggle="collapse" data-target=".js-navbar">
        <span class="sr-only">Toggle navigation</span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
      </button>
      <a class="navbar-brand" href="#" style="padding:15px 15px;">Название проекта</a>
    </div>
    <div class="collapse navbar-collapse js-navbar">
      <ul class="nav navbar-nav">
        <li><a href="#">Главная</a>
        </li>
        <li class="dropdown">
          <a id="drop1" href="#" class="dropdown-toggle" data-toggle="dropdown">
            Меню
            <span class="caret"></span>
          </a>
          <ul class="dropdown-menu">
            <li><a href="#">Текст подпункта</a>
            </li>
            <li><a href="#">Текст подпункта</a>
            </li>
            <li class="divider"></li>
            <li><a href="#">Текст подпункта</a>
            </li>
          </ul>
        </li>
        <li class="dropdown">
          <a id="drop1" href="#" class="dropdown-toggle" data-toggle="dropdown">
            Меню
            <span class="caret"></span>
          </a>
          <ul class="dropdown-menu">
            <li><a href="#">Текст подпункта</a>
            </li>
            <li><a href="#">Текст подпункта</a>
            </li>
            <li class="divider"></li>
            <li><a href="#">Текст подпункта</a>
            </li>
          </ul>
        </li>
      </ul>
      <ul class="nav navbar-nav navbar-right">
        <li class="dropdown">
          <a id="drop1" href="#" class="dropdown-toggle" data-toggle="dropdown">
            Меню
            <span class="caret"></span>
          </a>
          <ul class="dropdown-menu">
            <li><a href="#">Текст подпункта</a>
            </li>
            <li><a href="#">Текст подпункта</a>
            </li>
            <li class="divider"></li>
            <li><a href="#">Текст подпункта</a>
            </li>
          </ul>
        </li>
      </ul>
    </div>
  </div>
</nav>

Answer:

A quick fix is ​​to expose overflow-y: visible on .navbar-collapse.in :

.navbar-collapse.in {
    overflow-y: visible;
}
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