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.hexagon {
  position: relative;
  width: 100px; 
  height: 57.74px;
  background-color: #6a08ca;
  margin: 28.87px 0;
}

.hexagon:before,
.hexagon:after {
  content: "";
  position: absolute;
  width: 0;
  border-left: 50px solid transparent;
  border-right: 50px solid transparent;
}

.hexagon:before {
  bottom: 100%;
  border-bottom: 28.87px solid #6a08ca;
}

.hexagon:after {
  top: 100%;
  width: 0;
  border-top: 28.87px solid #6a08ca;
}

<div class="hexagon"></div>