JSFiddle - React, Tailwind, and code Playground

HTML

<img src="http://i.dailymail.co.uk/i/pix/2012/11/15/article-0-1609D0FF000005DC-373_964x641.jpg" />
<img src="http://blog.gettyimages.com/wp-content/uploads/2013/01/Siberian-Tiger-Running-Through-Snow-Tom-Brakefield-Getty-Images-200353826-001-628x419.jpg" />
<img src="http://upload.wikimedia.org/wikipedia/commons/thumb/e/e5/Seine_wide.jpg/797px-Seine_wide.jpg" />
<img src="http://wvs.topleftpixel.com/photos/scotia_plaza_tall_stitched.jpg" />

CSS

img {
    max-width: 70px;
    width: 100%;
    height: 25px;
}