<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<style>
*{
padding: 0;
margin: 0;
}
#span1{
margin-right: 20px;
background-color: lightgreen;
}
#span2{
margin-left: 30px;
background-color: pink;
}
</style>
<title>行级标签的左右外边距</title>
</head>
<body>
<!--水平排放的盒子，水平间距是margin的累加-->
<span id="span1">节日风俗</span>
<span id="span2">节日风俗</span>
</body>
<html>
