JSFiddle - React, Tailwind, and code Playground

HTML

<div>
    <ul>
        <li>List-item
            <ul>
                <li>Sub-list-item</li>
                <li>Sub-list-item</li>
            </ul>
        </li>
        <li>List-item
            <ul>
                <li>Sub-list-item</li>
                <li>Sub-list-item</li>
                <li>Sub-list-item</li>
                <li>Sub-list-item</li>
            </ul>
        </li>
         <li>List-item
            <ul>
                <li>Sub-list-item</li>
                <li>Sub-list-item</li>
                <li>Sub-list-item</li>
                <li>Sub-list-item</li>
            </ul>
        </li>
    </ul>
</div>

CSS

ul {
    list-style: none;
    margin:0;
    padding:0;
}
ul > li {
    display: inline-block;
    width: 100%;
}
ul > li > ul >li {
    color: red;
}
div {
    -webkit-column-count:3;
    -moz-column-count:3;
    -ms-column-count:3;
    -o-column-count:3;
    column-count:3;
    -webkit-column-gap:15px;
    -moz-column-gap:15px;
    -ms-column-gap:15px;
    -o-column-gap:15px;
    column-gap:15px;
    columns:3;
}