JSFiddle - React, Tailwind, and code Playground

by isherwood

HTML

<div class="hrLine"></div>

CSS

.containingBox0 {
    float: left;
    width: 93%;
    background-color: white;
    padding: 5px;
    border: solid 1px #C8C8C8;
    margin: 10px;
    height: auto;
}
.hrLine {
    background-color:grey;
    width:1px;
    float:left;
    height:100px;
}

JavaScript

$(".containingBox0").each(function () {
    txt = $(this).outerHeight();
    $(this).siblings(".hrLine").css('height', txt);
});