WebLearn/study/元素外间距重叠.html at master · BoilTask/WebLearn · GitHub

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<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<meta name="viewport" content="width=device-width,initial-scale=1" />
		<meta http-equiv="X-UA-Compatible" content="ie=edge">
		<title>Document</title>
		<style>
			body {
				margin: 0;
			}

			.rect {
				height: 40px;
				border: solid 1px black;
				background-color: aquamarine;
				margin: 20px 0;
			}

			#d2 {
				margin: 30px 0;
			}

			#box {
				margin: 10px;

				/* border: solid 1px red; */
				background-color: red;
			}
		</style>
	</head>
	<body>
		<!-- 块元素与块元素之间的上下外间距会产生重叠，按照两个元素较大的外间距显示 -->
		<!-- 相邻的两个块元素，子元素和父元素的外间距都会产生重叠 -->

		<div id="box">
			<div class="rect"></div>
			<div class="rect" id="d2"></div>
			<div class="rect"></div>
		</div>
	</body>
</html>