<!DOCTYPE html>
<html>

<head>
  <link rel="stylesheet" href="style.css">
  <script src="script.js"></script>
  <style>
    html, body {
      height: 100%;
      width: 100%;
    }
    #div-1 {
      overflow-y: auto;
      overflow-x: hidden;
      box-sizing: border-box;
      position:relative;
      z-index:1;
      border: 1px solid red;
      width:200px;
      /*Enable this and it will block link*/
      /*width:100%;*/ 
      height:290px;
    }
    .container {
      display: none;
      width: 200px;
      height:290px;
      background: orange;
    }
    #div-2 a {
      width: 13%;
      height: auto;
      padding: 0.5em 2.3em;
      display: block;
      position: fixed;
      font-weight: 500;
      font-size: 1.09em;
      text-align: center;
      background-color: none;
      text-decoration: none;
      outline: none;
      /* It's not clear whether you want the link above or
      | below the container. If above, simply change to
      | z-index: 2
      */
      z-index: 0;
      /* If you have a fixed element give it coords, otherwise       | it doesn't know where it should stand and behavior
      | will be unexpected.
      */
      top: 10%;
      left:125px;
    }
    #div-2 a:hover {
      background:red;
      color:white;
    }
    /* FLAG is just to test the accessibility of the link */ 
    #FLAG {
      display:none;
    }
    #FLAG:target {
      display:block;
      font-size:48px;
      color:red;
    }
  </style>
</head>

<body>
  <button id='button-f'>F</button>
  <div id="div-1">
    <div class="container">Container is open</div>
  </div>

  <!-- other divs like 5 or 6 of 'em -->

  <div id="div-2">
    <a href="#FLAG">This is a link</a>
    <span id='FLAG'>This link is accessible now!</span>
  </div>
  
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.2.2/jquery.min.js"></script>
  <script>
  /* This is the jQuery you need to accomplish what you want
  | The rest was redundant and unnecessary.
  */
    $(document).ready(function() {
      
      $("#button-f").click(function(e) {
        $(".container").toggle();
        
      });

    });
  </script>
</body>

</html>
// Code goes here

/* Styles go here */