title: Making content responsible between fixed divs
body: <p>so here is what I currently have. The red marked stuff is fixed, so it will stay on screen. Only the content in the middle is actually scrollable.
  <a href="https://i.stack.imgur.com/0u8Sn.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/0u8Sn.jpg" alt="enter image description here"></a></p>
  
  <p>I currently have all the fixed like this (example on the right bar with the 3 game icons) in my css:  </p>
  
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="false" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-css lang-css prettyprint-override"><code>                 margin-top: 102px;
      right: 0;
      position: fixed;
      height: 100%;
      width: 123px;</code></pre>
  </div>
  </div>
  </p>
  
  <p>And my content is basicly just a fixed size with a margin-left.<br>
  So it looks fine, right? My problem is tho, if the middle content isn't scrollable (trough for example no games) the scrollbar on the right disappears and a gap appears, obviously.
  <a href="https://i.stack.imgur.com/c29KW.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/c29KW.jpg" alt="enter image description here"></a></p>
  
  <p>How can I make this responsible, so it fits everytime?</p>