JSFiddle - React, Tailwind, and code Playground

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
-->

<header>
<nav class="navbar navbar-expand-md navbar-light bg-light">
  <a class="navbar-brand" href="#">Navbar</a>
  <button class="navbar-toggler" type="button"
          data-toggle="collapse" data-target="#navbarText">
    <span class="navbar-toggler-icon"></span>
  </button>
  <div class="collapse navbar-collapse" id="navbarText">
    <ul class="navbar-nav mr-auto">
      <li class="nav-item active">
        <a class="nav-link" href="#">Home <span class="sr-only">(current)</span></a>
      </li>
      <li class="nav-item">
        <a class="nav-link" href="#">Features</a>
      </li>
      <li class="nav-item">
        <a class="nav-link" href="#">Pricing</a>
      </li>
    </ul>
    <span class="navbar-text">
      Navbar text with an inline element
    </span>
  </div>
</nav>
</header>

<div class="container" style="margin-top: 3.5rem;">
  <div class="row">
    <div class="col-md-9" align="middle"
          style="max-height: 80%; 
                 max-width: 100%; 
                 border: 1px solid black;
                 background-color: rgb(82, 86, 89);
                 margin-bottom: 40px">
      <img src="https://via.placeholder.com/750x950"
           alt="Segmentation Plot Image" 
           style="width: 90%; margin: 20px;">
    </div>
    <div class="col-md-3" align="center" style="margin-bottom: 40px;">
      <button class="btn btn-success btn-custom">
        <span>Button 1</span>
      </button>
      <br>
      <button class="btn...

CSS

.btn-custom {
  width: 200px;
  margin: 5px 5px 5px 5px;
}