JSFiddle - React, Tailwind, and code Playground

HTML

<div class="talkingPointsHolder">
    <div class="genericScriptsHolder"> 
        <span class="listHeader">List One</span>

        <ul
        class="scrollingList">
            <li>item 1.1</li>
            <li>item 1.2</li>
            <li>item 1.3</li>
            <li>item 1.4</li>
            <li>item 1.5</li>
            <li>item 1.6</li>
            <li>item 1.7</li>
            <li>item 1.8</li>
            <li>item 1.9</li>
            <li>item 1.10</li>
            <li>item 1.11</li>
            <li>item 1.12</li>
            </ul>
    </div>
    <div class="genericScriptsHolder"> 
        <span class="listHeader">List Two</span>

        <ul
        class="scrollingList">
            <li>item 2.1</li>
            <li>item 2.2</li>
            <li>item 2.3</li>
            <li>item 2.4</li>
            <li>item 2.5</li>
            <li>item 2.6</li>
            <li>item 2.7</li>
            <li>item 2.8</li>
            <li>item 2.9</li>
            <li>item 2.10</li>
            <li>item 2.11</li>
            <li>item 2.12</li>
            </ul>
    </div>
</div>

CSS

.talkingPointsHolder {
    border: 1px solid black;
    background: #eeeeee;
    height: 200px;
    overflow: auto;
}

.genericScriptsHolder {
    float: left;
    width: 48%;
    margin: 0px 2px 0px 2px;
    /* uncomment to make the title match the ul width (see listHeader too)*/
    /*position: relative;*/
}

.listHeader {
    color: #ffffff;
    background: #444444;
    padding: 10px 0px 10px 0px;
    text-transform: uppercase;
    font-weight:bold;
    font-size:11px;
    text-align: left;
    text-indent: 1em;
    position: absolute;
    z-index:10;
    
    /* uncomment to make the title match the ul width (see genericScriptsHolder too)*/
    /*width: 100%;*/
}

.scrollingList {
    position: relative;
    top: 31px;
}

.scrollingList li {
    overflow: auto;
    height: 20px;
    color: #666666;
    background-color: #cccccc;
    font-weight: lighter;
    padding: 10px;
    margin: 2px;
    list-style-type: none;
}