JSFiddle - React, Tailwind, and code Playground

by infatti

HTML

<link rel="stylesheet" href="//netdna.bootstrapcdn.com/bootstrap/3.0.2/css/bootstrap.min.css">
  <div class="col-xs-5" style="background: #777">
    <p>short box</p>
  </div>
  <div class="col-xs-5" style="background: #eee">
    <p>long box</p>
    <p>long box</p>
    <p>long box</p>
    <p>long box</p>
    <p>long box</p>
    <p>long box</p>
    <p>long box</p>
    <p>long box</p>
    <p>long box</p>
    <p>long box</p>
  </div>

  <div class="col-xs-5" style="background: #ddd">
    <p>Make me vertically align with box above me.</p>
    <p>long box</p>
    <p>long box</p>
    <p>long box</p>
    <p>long box</p>
    <p>long box</p>
    <p>long box</p>
    <p>long box</p>
    <p>long box</p>
    <p>long box</p>
    <p>long box</p>
    <p>long box</p>
    <p>long box</p>
    <p>long box</p>
    <p>long box</p>
    <p>long box</p>
    <p>long box</p>
    <p>long box</p>
    <p>long box</p>
    <p>long box</p>
  </div>
  <div class="col-xs-5" style="background: #555">
    <p>short box</p>
    <p>short box</p>
    <p>short box</p>
  </div>

CSS

/*!
 * Bootstrap v3.0.2 by @fat and @mdo
 * Copyright 2013 Twitter, Inc.
 * Licensed under http://www.apache.org/licenses/LICENSE-2.0
 *
 * Designed and built with all the love in the world by @mdo and @fat.
 */

/*! normalize.css v2.1.3 | MIT License | git.io/normalize */

article,
aside,
details,
figcaption,
figure,
footer,
header,
hgroup,
main,
nav,
section,
summary {
  display: block;
}

audio,
canvas,
video {
  display: inline-block;
}

audio:not([controls]) {
  display: none;
  height: 0;
}

[hidden],
template {
  display: none;
}

html {
  font-family: sans-serif;
  -webkit-text-size-adjust: 100%;
      -ms-text-size-adjust: 100%;
}

body {
  margin: 0;
}

a {
  background: transparent;
}

a:focus {
  outline: thin dotted;
}

a:active,
a:hover {
  outline: 0;
}

h1 {
  margin: 0.67em 0;
  font-size: 2em;
}

abbr[title] {
  border-bottom: 1px dotted;
}

b,
strong {
  font-weight: bold;
}

dfn {
  font-style: italic;
}

hr {
  height: 0;
  -moz-box-sizing: content-box;
       box-sizing: content-box;
}

mark {
  color: #000;
  background: #ff0;
}

code,
kbd,
pre,
samp {
  font-family: monospace, serif;
  font-size: 1em;
}

pre {
  white-space: pre-wrap;
}

q {
  quotes: "\201C" "\201D" "\2018" "\2019";
}

small {
  font-size: 80%;
}

sub,
sup {
  position: relative;
  font-size: 75%;
  line-height: 0;
  vertical-align: baseline;
}

sup {
  top: -0.5em;
}

sub {
  bottom: -0.25em;
}

img {
  border: 0;
}

svg:not(:root) {
  overflow: hidden;
}

figure {
  margin: 0;
}

fieldset {
  padding: 0.35em 0.625em 0.75em;
  margin: 0 2px;
  border: 1px solid #c0c0c0;
}

legend {
  padding: 0;
  border: 0;
}

button,
input,
select,
textarea {
  margin: 0;
  font-family: inherit;
  font-size: 100%;
}

button,
input {
  line-height: normal;
}

button,
select {
  text-transform: none;
}

button,
html input[type="button"],
input[type="reset"],
input[type="submit"] {
  cursor: pointer;
  -webkit-appearance: button;
}

button[disabled],
html input[disabled] {
  cursor:...