1.下外边距
代码：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>盒子模型之外边距</title>
<style>
div{
width: 200px;
height: 200px;
background-color: pink;
}
.one{
margin-bottom: 20px;
}
</style>
</head>
<body>
<div class="one">1</div>
<div>2</div>
</body>
</html>运行效果：
2.上外边距
代码：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>盒子模型之外边距</title>
<style>
div{
width: 200px;
height: 200px;
background-color: pink;
}
.two{
margin-top: 20px;
}
</style>
</head>
<body>
<div class="one">1</div>
<div class="two">2</div>
</body>
</html>运行效果：
3.margin的简写方式
marrgin：30px 上下左右都是30像素
代码：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>盒子模型之外边距</title>
<style>
div{
width: 200px;
height: 200px;
background-color: pink;
}
/* .one{
margin-bottom: 20px;
} */
.two{
/* margin-top: 20px; */
margin: 30px;
}
</style>
</head>
<body>
<div class="one">1</div>
<div class="two">2</div>
</body>
</html>运行效果：
和padding写法类似