<div class="block"></div>
.block{
  height:500px;
  width:1000px;
  background-image:url("https://bennettfeely.com/clippy/pics/fierenze.jpg");
  clip-path: polygon(50% 100%, 75% 55%, 100% 100%, 0 100%, 26% 55%);

}
/*https://bennettfeely.com/clippy */

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