利用CSS3实现三角形的制作

<div class="arrow-up">
     <!--向上的三角-->
</div>

<div class="arrow-down">
    <!--向下的三角-->
</div>

<div class="arrow-left">
    <!--向左的三角-->
</div>

<div class="arrow-right">
    <!--向右的三角-->
</div>

/* create an arrow that points up */
div.arrow-up {
	width:0px;
	height:0px;
	border-left:50px solid transparent; /* left arrow slant */
	border-right:50px solid transparent; /* right arrow slant */
	border-bottom:50px solid #f00; /* bottom, add background color here */
	font-size:0px;
	line-height:0px;
}

/* create an arrow that points down */
div.arrow-down {
	width:0px;
	height:0px;
	border-left:50px solid transparent;
	border-right:50px solid transparent;
	border-top:50px solid #ff0;
	font-size:0px;
	line-height:0px;
}

/* create an arrow that points left */
div.arrow-left {
	width:0px;
	height:0px;
	border-bottom:50px solid transparent; /* left arrow slant */
	border-top:50px solid transparent; /* right arrow slant */
	border-right:50px solid #f0f; /* bottom, add background color here */
	font-size:0px;
	line-height:0px;
}

/* create an arrow that points right */
div.arrow-right {
	width:0px;
	height:0px;
	border-bottom:50px solid transparent; /* left arrow slant */
	border-top:50px solid transparent; /* right arrow slant */
	border-left:50px solid #0ff; /* bottom, add background color here */
	font-size:0px;
	line-height:0px;
}

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