JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
    <div class="box">1</div>
    <div class="box">2</div>
    <div class="box">3</div>
    <div class="box">4</div>
    <div class="box">5</div>
    <div class="box">6</div>
    <div class="box">7</div>
    <div class="box">8</div>
    <div class="box">9</div>
    <div class="box">10</div>
    <div class="box">11</div>
    <div class="box">12</div>
    <div class="box">13</div>
</div>
<div class="container">
    <div class="box">1</div>
    <div class="box">2</div>
    <div class="box">3</div>
    <div class="box">4</div>
    <div class="box">5</div>
    <div class="box">6</div>
    <div class="box">7</div>
</div>

CSS

body {
    margin:0;
}
.container {
    height: 600px;
    min-width: 150px;
    margin-right: 10px;
    display: -webkit-box;
    display: -webkit-flex;
    display: -moz-box;
    display: -ms-flexbox;
    display: inline-flex;
    -webkit-flex-flow: column wrap;
    -moz-flex-flow: column wrap;
    -ms-flex-flow: column wrap;
    -o-flex-flow: column wrap;
    flex-flow: column wrap;
    background-color: #CFC;
}
.container .box {
    width: 100px;
    height: 100px;
    margin: 5px;
    background-color: silver;
}

JavaScript

$('.container').each(function () {
    // Find the biggest offset right
    var maxOffsetRight = 0,
        currentOffsetRight;

    $(this).children().each(function (index) {
        currentOffsetRight = $(this).position().left + $(this).outerWidth(true);
        if (currentOffsetRight > maxOffsetRight) {
            maxOffsetRight = currentOffsetRight;
        }
    });

    var offsetLeft = $(this).position().left;
    $(this).css('width', maxOffsetRight - offsetLeft);
});