Containers like the ones above can be added by editing the source for the content and adding:
<span class="flex-container"> to the top of the section and
</span> at the bottom. For example:
<span class="flex-container">
<h2>Purpose</h2>
<p>This project aims to:<br/></p>
<ul>
<li>Lorem ipsum odor amet, consectetuer adipiscing elit.</li>
<li> Tempus risus praesent bibendum purus inceptos nam, felis aliquam. </li>
<li>Aptent volutpat accumsan viverra cras non porttitor dignissim consectetur. </li>
<li>Imperdiet curae dignissim, neque mus placerat eleifend. <br/></li>
</ul>
</span>