<div class="container">
  <img src="http://tympanus.net/codrops-playground/assets/images/cssref/properties/isolation/isolation-destination.jpg" alt="Yellow tree.">
  <div class="text-wrapper">
    <h1>SUNSHINE</h1>
  </div>
</div>
* {
  box-sizing: border-box;
}

body {
  background-color: #fff;
  color: #555;
  font-size: 1.1em;
  font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
}

.container {
  margin: 1em auto;
  width: 100%;
  max-width: 814px;
  position: relative;
}

img {
  width: 100%;
}

.container h1 {
  position: absolute;
  top: 3em;
  color: white;
  text-align: center;
  font-size: 5vw;
  width: 100%;
  text-transform: uppercase;
  background-color: purple;
  padding: .5em .25em;
  mix-blend-mode: overlay;
}

.text-wrapper {
  /*    isolation: isolate;*/
}