JSFiddle - React, Tailwind, and code Playground

StackOverflow solution for: http://stackoverflow.com/questions/15145420/can-i-make-height-100-work-like-width-100

HTML

<section>
    <div class="inner">
    <div id="one"><p>Lorem</p></div>
    <div id="two">
        <p>Sed ut perspiciatis unde omnis iste natus error sit voluptatem accusantium dolae dicta sunt explicabo. Nemo enim ipsam voluptatem quia voluptas sit aspernatur aut odit aut fugit, sed quia consequuntur magni dolores eos qui ratione voluptatem sequi nesciunt. Neque porro quisquam est, qui dolorem ipsum quia dolor sit amet, consectetur, adipisci velit, sed quia non numquam eius modi tempora incidunt ut labore</p>
    </div>
    </div>
    <div class="clear"></div>
</section>

CSS

section {
    width: 80%;
    margin: 0 auto;
    border: 1px solid #ccc;
    border-radius: 5px;
}
#one, #two {
    float: left;
    width: 50%;
}
#one {
    background: rgb(230,230,230);
}
.clear {
    clear: both;
}

.inner {
    overflow: hidden;
}
.inner div {
    margin-bottom: -1000px;
    padding-bottom: 1000px;
}