NrrRQy

index.html

<div class="centered">
  <div class="logo">
    <img src="http://placehold.it/350x350">
  </div>
  <div class="caption">
    <p>Percentage sized and still centered.</p>

  </div>
</div>

NrrRQy.markdown

NrrRQy

A Pen by Piotr Łepkowski on CodePen.

License.

style.css

body {
  background: #900;
}

.logo {
  height: 100%;
  position: relative;
}

img {
  //height: 100%;
  max-width: 100%;
  max-height: 100%;
  position: relative;
}
.caption{
display: block;
  position: relative;
padding:0;
  background: #ccc;
  margin-top: 25px;
}
p{
  margin: 0;
  padding: 10px;
}
.centered {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  /*
  This doesn't work
  margin-left: -25%;
  margin-top: -25%;
  */
  width: 40%;
  height: 50%;
  padding: 20px;
  background: red;
  color: white;
  text-align: center;
  box-shadow: 0 0 30px rgba(0, 0, 0, 0.2);
}