CodePen Embed - pdeoxb

<div class="demo"></div>

.demo{ 	
width:640px; height:480px;
background:url(http://lorempixel.com/output/nature-q-c-640-480-1.jpg) no-repeat; 
background-size:100% cover;
-webkit-clip-path: polygon(20% 0%, 80% 0%, 63% 48%, 100% 80%, 80% 100%, 20% 100%, 0% 80%, 0% 20%);
clip-path: polygon(20% 0%, 80% 0%, 63% 48%, 100% 80%, 80% 100%, 20% 100%, 0% 80%, 0% 20%);
}

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