fixed side menu

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/semantic-ui/2.2.6/semantic.min.js"></script>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/semantic-ui/2.2.6/semantic.min.css">
<div class="ui inverted left vertical fixed menu" id="side-menu">
  <div class="item">
    Item #1
  </div>
  <div class="item">
    Item #2
  </div>
</div>
<div class="ui inverted top fixed menu">
  <div class="header item">
    Top Menu Header
  </div>
</div>
<div class="ui grid">
  <!-- Main content here -->
  <div class="column">
    <div class="row">
      Text here
    </div>
    <div class="row">
      Text here
    </div>
    <div class="row">
      Text here
    </div>
    <div class="row">
      Text here
    </div>
    <div class="row">
      Text here
    </div>
    <div class="row">
      Text here
    </div>
    <div class="row">
      Text here
    </div>
    <div class="row">
      Text here
    </div>
    <div class="row">
      Text here
    </div>
    <div class="row">
      Text here
    </div>
    <div class="row">
      Text here
    </div>
    <div class="row">
      Text here
    </div><div class="row">
      Text here
    </div>
    <div class="row">
      Text here
    </div>
    <div class="row">
      Text here
    </div>
    <div class="row">
      Text here
    </div>
    <div class="row">
      Text here
    </div>
    <div class="row">
      Text here
    </div>
  </div>
</div>

CSS

#side-menu {
  height: 100vh;
}