JSFiddle - React, Tailwind, and code Playground

HTML

<section>
<ol id="reports"><h3>Reports</h3>
<li>test_12345</li>
<li>test_1405114424964</li></ol>
<button style="float:right;">Execute Test      </button></section>

CSS

section {
    display: flex;
}
button{
    clear: left;
    background-color:#699DB6;
    border-color:rgba(0,0,0,0.3);
    padding: 10px 30px;
    border-radius: 5px;
    float: right;
}