Customize container-fluid

HTML

<script src="//code.jquery.com/jquery-3.3.1.slim.min.js"></script>
<link rel="stylesheet" href="//stackpath.bootstrapcdn.com/bootstrap/4.1.0/css/bootstrap.min.css">
<script src="//cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.0/umd/popper.min.js"></script>
<script src="//stackpath.bootstrapcdn.com/bootstrap/4.1.0/js/bootstrap.min.js"></script>
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css">
<!-- 
  Bootstrap docs: https://getbootstrap.com/docs
-->

<div class="container-fluid custom-class">
  <div class="row">

    <div class="col-md-6" style="background-color:red; min-height:100px;">
      sample
    </div>

    <div class="col-md-6" style="background-color:yellow; min-height:100px;">
      sample
    </div>

  </div>
</div>

CSS

.custom-class {
  max-width: 900px; /*Just for example, should be replaced by 1170px */
  margin: 0 auto;
}