JSFiddle - React, Tailwind, and code Playground

HTML

<section class="main">Header<br />subheader</section>
<aside>picture<br /><br />d</aside>
<aside>to be made sticky</aside>
<section class="main">List of things<br />
List of things<br />
List of things<br />
    List of things<br />
    List of things<br />
    List of things<br />
        

</section>

CSS

.main {
            width: 60%;
            margin-right: 5%;
            float: left;
    background-color:pink;
        }

aside {
width: 35%;
float: right;

    background-color:#aaa;
    margin-bottom:10px;
        }