JSFiddle - React, Tailwind, and code Playground

HTML

<div>
    <span>
        <ul>
            <li>1</li> <li>2</li> <li>3</li>
            <li>4</li> <li>5</li> <li>6</li>
            <li>7</li> <li>8</li> <li>9</li>
            <li>1</li> <li>2</li> <li>3</li>
            <li>4</li> <li>5</li> <li>6</li>
            <li>7</li> <li>8</li> <li>9</li>
            <li>1</li> <li>2</li> <li>3</li>
            <li>4</li> <li>5</li> <li>6</li>
            <li>7</li> <li>8</li> <li>9</li>
        </ul>
    </span>
</div>

CSS

span
{
    display: block;
    overflow: auto;
}
ul
{
    white-space: nowrap;
    overflow: visible;
}
li
{
    display: inline-block;
}
/* decorations. */
ul
{
    display: inline-block;
    border-top: 1px solid blue;
    border-radius: -4px;
    margin: 0px;
    padding: 0px;
}
li
{
    list-style: none;
    padding: 2px;
    background: #FFF;
    color: #000;
    border: 1px solid cyan;
    border-top-style: none;
    border-radius: 2px;
    margin: 2px;
    position: relative;
    top: -3px;
    box-shadow: 2px 2px 2px black;
}
li:before, li:after
{
    font-weight: bold;
    font-size: larger;
    content: "::";
}