Bootstrap 4

HTML

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css">
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js"></script>
<div class="main h-100">
  <nav class="navbar navbar-expand-lg navbar-dark bg-primary">
    <a href class="navbar-brand">Menu</a>
  </nav>
  <div class="container-fluid h-100">
    <div class="row h-100">
      <div class="col-xs-2 bg-light h-100 pr-3 menuContainer">
        <button class="btn btn-outline-primary mt-3 btn-sm btn-block"> Test </button>
        <nav class="navbar navbar-light list">
          <ul class="navbar-nav flex-column">
           <li class="nav-item"><a href="#" class="nav-link">A1</a></li>
           <li class="nav-item"><a href="#" class="nav-link">A1</a></li>
         
          </ul>
        </nav>
      </div>
      <div class="col-xs-10 p-0">
        Content
      </div>
    </div>
  </div>
</div>

CSS

body {
  height: 100vh;
}

.bg-light {
  background-color: green !important;
}

.list {
  overflow-y: auto;
  height: 100%;
  align-items:start
}

.menuContainer {
  display: flex;
  flex-flow: row wrap;
}

.list {
  flex: 1;
  background-color: red;
}