JSFiddle - React, Tailwind, and code Playground

HTML

<div class="background">
     <div class="inner">
     </div>
</div>

CSS

html, body {
  height: 100%;
  width: 100%;
}
.background {
  width: 100%;
  height: 100%;
  background: url('http://farm9.staticflickr.com/8242/8558295633_f34a55c1c6_b.jpg');
}
.inner {
  width: 100%;
  height: 100%;
  border-top: 130px solid rgba(255, 255, 255, 0.5);
  border-bottom: 130px solid rgba(255, 255, 255, 0.5);
  border-left:  100px solid rgba(255, 255, 255, 0.5);
  border-right:  100px solid rgba(255, 255, 255, 0.5);
  box-sizing: border-box;
}