HTML/07_triangle.html at master · HappyJess/HTML · GitHub

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html lang="en">
<head>
	<meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
	<title>DIV+CSS画三角形</title>
	<style>
	    *{
	    	padding: 0;
	    	margin: 0;
	    }
	    .tree{
	    	position: relative;
	    }
	    .tree div{
	    	position: absolute;
	    	width: 0;
	    	height: 0;
	    }
	    .tree .wood{
	    	width: 20px;
	    	height: 50px;
	    	background-color:gray;
	    	left: 50%;
	    	margin-left: -10px;
	    	top: 170px;}
	    .a1{
	    	border-right: 40px solid green;
	    	border-top: 40px solid #fff;
	    	left: 50%;
	    	margin-left: -40px;
	    	top: 0;
	    }
	    .a2{
	    	border-left: 40px solid green;
	    	border-top: 40px solid #fff;
	    	left: 50%; top: 0;
	    }
	    .b1{
	    	border-right: 70px solid green;
	    	border-top: 70px solid #fff;
	    	left: 50%;
	    	margin-left: -70px;
	    	top: 20px;
	    }
	    .b2{
	    	border-left: 70px solid green;
	    	border-top: 70px solid #fff;
	    	left: 50%;
	    	top: 20px;
	    }
	    .c1{
	    	border-right: 100px solid green;
	    	border-top: 100px solid #fff;
	    	left: 50%;
	    	margin-left: -100px;
	    	top: 70px;
	    }
	    .c2{
	    	border-left: 100px solid green;
	    	border-top: 100px solid #fff;
	    	left: 50%;
	    	top: 70px;
	    }
	</style>
</head>
<body>
	<div class="tree">
	    <div class="wood"></div>
	    <div class=c1></div>
	    <div class=c2></div>
	    <div class=b1></div>
	    <div class=b2></div>
	    <div class="a1"></div>
	    <div class="a2"></div>
	</div>
</body>
</html>