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/*<div class="arrow-up"></div>
<div class="arrow-down"></div>
<div class="arrow-left"></div>
<div class="arrow-right"></div>*/

/*Source: http://css-tricks.com/snippets/css/css-triangle/*/

.arrow-up {
	width: 0;
	height: 0;
	border-left: 5px solid transparent;
	border-right: 5px solid transparent;

	border-bottom: 5px solid black;
}

.arrow-down {
	width: 0;
	height: 0;
	border-left: 20px solid transparent;
	border-right: 20px solid transparent;

	border-top: 20px solid #f00;
}

.arrow-right {
	width: 0;
	height: 0;
	border-top: 60px solid transparent;
	border-bottom: 60px solid transparent;

	border-left: 60px solid green;
}

.arrow-left {
	width: 0;
	height: 0;
	border-top: 10px solid transparent;
	border-bottom: 10px solid transparent; 

	border-right:10px solid blue;
}