JSFiddle - React, Tailwind, and code Playground

HTML

<div class="wrapper">
    <ul>
        <li>1<br/>1<br/>1</li>
        <li>3</li>
        <li>5</li>
        <li>7</li>
        <li>9</li>
        <li>11</li>
        <li>13</li>
        <li>15</li>
        <li>2</li>
        <li>4<br/>4<br/>4</li>
        <li>6</li>
        <li>8</li>
        <li>10</li>
        <li>12<br/>12<br/>12</li>
        <li>14</li>
    </ul>
</div>

CSS

.wrapper {
    width:350px;
    margin: 0px auto;
    border: 1px solid #eee;
}
ul {
    padding-left:10px;
    list-style-type: none;
    -moz-column-count: 2;
    -webkit-column-count: 2;
    column-count: 2;
}
ul li {
    display:inline-block;
    width: 150px;
    background: tomato;
    border: 1px solid #515151;
    margin-top:10px;
}