JSFiddle - React, Tailwind, and code Playground

HTML

<div id="parent">
    <div class="box">Box #1</div>
    <div class="box">Box #2</div>
    <div class="box">Box #3</div>
    <div class="box">Box #4</div>
    <div class="box">Box #5</div>
    <div class="box">Box #6</div>
    <div class="box">Box #7</div>
    <div class="box">Box #8</div>
    <div class="box">Box #9</div>
    <div class="box">Box #10</div>
    <div class="box">Box #11</div>
    <div class="box">Box #12</div>
    <div class="box">Box #13</div>
    <div class="box">Box #14</div>
    <div class="box">Box #15</div>
    <div class="box">Box #16</div>
    <div class="box">Box #17</div>
    <div class="box">Box #18</div>
    <div class="box">Box #19</div>
    <div class="box">Box #20</div>
</div>

CSS

#parent {
    width: 100%;
    height: 500px;
    background: #eee;
    
    -moz-column-count: 3;
    -moz-column-gap: 20px;
    -webkit-column-count: 3;
    -webkit-column-gap: 20px;
}
#parent .box {
    width: 250px;
    height: 80px;
    background: #AAA;
    margin-bottom: 10px;
    display: inline-block;
}