JSFiddle - React, Tailwind, and code Playground

HTML

<ol>
    <li>
        One
    </li>
    <li class="borderlist">
        Two
        <ol>
            <li>Red</li>
            <li>Blue</li>
        </ol>
    </li>
    <li>
        Three
    </li>
</ol>

CSS

.borderlist 
{
    list-style-position:inside;
    border: 1px solid black;
}