<div class="img"></div>
<div class="block"></div>
.img {
	display: block;
  position: relative;
	background: #1395ba;
	width: 500px;
	height: 250px;
	margin: 50px;
	-webkit-clip-path: polygon(0 0, 100% 0, 100% 90%, 0 100%);
	clip-path: polygon(0 0, 100% 0, 100% 90%, 0 100%);
}

.block {
	background: #2499d5;
  position: relative;
  z-index: 1;
  width: 500px;
  height: 250px;
  margin: 50px;
}
.block:after {
	background: inherit;
	bottom: 0;
	content: '';
	display: block;
	height: 50%;
	left: 0;
	position: absolute;
	right: 0;
	transform: skewY(-5deg);
	transform-origin: 100%;
	z-index: -1;
}
.block:before {
	background: inherit;
  bottom: 0;
  content: '';
  display: block;
  height: 50%;
  top: 0;
  position: relative;
  right: 0;
  transform: skewY(5deg);
  transform-origin: 100%;
  z-index: -1;
}

External CSS

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External JavaScript

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