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<!DOCTYPE html>
<html lang="en">

<head>
	<meta charset="UTF-8">
	<meta name="viewport" content="width=device-width, initial-scale=1.0">
	<meta http-equiv="X-UA-Compatible" content="ie=edge">
	<title>CSS扇形</title>
	<style>
		.pie {
			position: relative;
			margin: 1em auto;
			padding: 0;
			width: 32em;
			height: 32em;
			border-radius: 50%;
			list-style: none;
			overflow: hidden;
		}

		.slice {
			overflow: hidden;
			position: absolute;
			top: 0;
			right: 0;
			width: 50%;
			height: 50%;
			transform-origin: 0% 100%;
		}

		.slice-one {
			transform: rotate(30deg) skewY(-30deg);
			background: black;
		}

		.slice-two {
			transform: rotate(-30deg) skewY(-30deg);
			background: yellow;
		}

		.slice-three {
			transform: rotate(-90deg) skewY(-30deg);
			background: black;
		}

		.slice-four {
			transform: rotate(-150deg) skewY(-30deg);
			background: yellow;
		}

		.slice-five {
			transform: rotate(-210deg) skewY(-30deg);
			background: black;
		}

		.slice-six {
			transform: rotate(-270deg) skewY(-30deg);
			background: yellow;
		}
	</style>
</head>

<body>
	<ul class='pie'>
		<li class='slice-one slice'> </li>
		<li class='slice-two slice'> </li>
		<li class='slice-three slice'> </li>
		<li class='slice-four slice'> </li>
		<li class='slice-five slice'> </li>
		<li class='slice-six slice'> </li>
    <ul>
</body>