<div class="container">
  <p>Change the value of the <code>object-fit</code> property to see the image content change accordingly.</p>
  <p>
    This is the original image:
  </p>
  <img src="http://tympanus.net/codrops-playground/assets/images/cssref/properties/object-fit/duck.jpg" alt="">
  <p>This is the image after being sized using <code>object-fit</code>:</p>
  <img class="fit" src="http://tympanus.net/codrops-playground/assets/images/cssref/properties/object-fit/duck.jpg" alt="">
</div>
body {
  color: #555;
  font-size: 1.1em;
  font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
}

.container {
  margin: 40px auto;
  max-width: 700px;
}

img {
  max-width: 100%;
}

img.fit {
  border: 5px solid maroon;
  width: 10em;
  height: 10em;
  -o-object-fit: contain;
  object-fit: contain;
}