Triange box css ctyle

treangl.css

.arrow-up {
	width: 0;
	height: 0;
	border-left: 15px solid transparent;
	border-right: 15px solid transparent;
	border-bottom: 30px solid black;
}

.arrow-down {
	width: 0;
	height: 0;
	border-left: 15px solid transparent;
	border-right: 15px solid transparent;
	border-top: 30px solid #f00;
}

.arrow-right {
	width: 0;
	height: 0;
	border-top: 15px solid transparent;
	border-bottom: 15px solid transparent;
	border-left: 30px solid green;
}

.arrow-left {
	width: 0;
	height: 0;
	border-top: 15px solid transparent;
	border-bottom: 15px solid transparent;
	border-right: 30px solid blue;
}