Edit in JSFiddle

<div></div>
* {
  box-sizing: border-box
}

html,
body {
  height: 100%;
  padding: 0;
  margin: 0;
}

div {
  width: 50%;
  height: 50%;
  margin: 25% auto;
  background: 
linear-gradient(45deg, transparent 15px, white 15px) no-repeat top right / 20px 50.1%,
linear-gradient(135deg, transparent 15px, white 15px) no-repeat bottom right / 20px 50.1%,
url('https://nlc.p3k.hu/data/cikk/18/171365/1.jpg') center / cover;
}