<ul></ul>
<nav></nav>
ul {
	padding: 20px 0;
	background: #FA911E;
	position: relative;
	margin-bottom: 100px;
}

ul:before {
	position: absolute;
	content: '';
	border-top: 15px solid #f44;
	border-right: 15px solid #333;
	border-left: 15px solid transparent;
	border-bottom: 15px solid transparent;
	top: 100%;
	left: 0;
}
ul:after {
	position: absolute;
	content: '';
	border-top: 15px solid #f44;
	border-left: 15px solid #333;
	border-right: 15px solid transparent;
	border-bottom: 15px solid transparent;
	top: 100%;
	right: 0;
}

nav {
	padding: 20px 0;
	background: #FA911E;
	position: relative;
}

nav:before {
	position: absolute;
	content: '';
	border-top: 15px solid #333;
	border-right: 15px solid #333;
	border-left: 15px solid transparent;
	border-bottom: 15px solid transparent;
	top: 100%;
	left: 0;
}
nav:after {
	position: absolute;
	content: '';
	border-top: 15px solid #333;
	border-left: 15px solid #333;
	border-right: 15px solid transparent;
	border-bottom: 15px solid transparent;
	top: 100%;
	right: 0;
}

External CSS

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External JavaScript

This Pen doesn't use any external JavaScript resources.