title: fixed Element gets unvisible on mobile devices
body: <p>I developed a sidebar. However I have a issue that the button required to open the sidebar gets invisible on mobile devices. If you know the position you can click on it and it works. The button to hide it works fine. </p>
  
  <p>Here is a link to the website:</p>
  
  <p><a href="https://gdi.ethz.ch/jenkins/pages/current.html" rel="nofollow">https://gdi.ethz.ch/jenkins/pages/current.html</a></p>
  
  <p>And here the relevant html:</p>
  
  <pre><code>&lt;div id="wrapper" class="container container-fluid col-md-12"&gt;
      &lt;header&gt;&lt;nav id="sidebar-wrapper"&gt;
      &lt;a href="#menu-toggle" id="menu-toggle"&gt;&lt;/a&gt;
      &lt;ul class="sidebar-nav"&gt;
         Some menue
      &lt;/ul&gt;
  &lt;/nav&gt;
  
  &lt;/header&gt;
      &lt;div id="main"&gt;
          the site content  
      &lt;/div&gt;
      &lt;footer&gt;&lt;/footer&gt;
  &lt;/div&gt;
  </code></pre>
  
  <p>And the css code:</p>
  
  <pre><code>#menu-toggle {
      position: fixed;
      overflow:hidden;
      z-index: 1100;
      background-color: #009bf0;
      color: white;
      top: 0;
      left: 249px;
      padding-left: 10px;
      padding-top: 3px;
      width: 40px;
      height: 40px;
      -webkit-transition: all 0.5s ease;
      -moz-transition: all 0.5s ease;
      -o-transition: all 0.5s ease;
      transition: all 0.5s ease;
  }
  #wrapper.toggled #menu-toggle {
      left: 0px;
  }
  
  #wrapper {
      padding-left: 0;
      -webkit-transition: all 0.5s ease;
      -moz-transition: all 0.5s ease;
      -o-transition: all 0.5s ease;
      transition: all 0.5s ease;
  }
  
  
  
  #wrapper.toggled {
      padding-left: 250px;
  }
  
  #sidebar-wrapper {
      z-index: 1000;
      position: fixed;
      left: 250px;
      width: 0;
      height: 100%;
      margin-left: -250px;
      overflow-y: auto;
      background: #009bf0;
      -webkit-transition: all 0.5s ease;
      -moz-transition: all 0.5s ease;
      -o-transition: all 0.5s ease;
      transition: all 0.5s ease;
  }
  </code></pre>