<figure>
  <img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/3/200x200.jpg" alt="" />
  <figcaption>What a lovely pattern we got there in this image which is encapsulted in a figure element. Oh dear, look how long this caption is!</figcaption>
</figure>

figure {
  width: -webkit-min-content;
  width: -moz-min-content;
  width: min-content;
  margin: 1em auto;
  background: #EFEFEF;
  border: 1px solid rgba(0,0,0,.1);
  padding: 1em;
}

img {
  display: block;
}

figcaption {
  padding: 1em 0;
}