<div/>

div {
  height: 100px;
  width: 100px;
  background-color: blue;
  clip-path: polygon(
    0 30%, 
    35% 30%,
    50% 0,
    65% 30%,
    100% 30%,
    75% 60%,
    90% 100%,
    50% 80%,
    10% 100%,
    25% 60%
  );
}