外边距margin

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>外边距margin</title>

<style>

#box1{
width: 300px;
height: 300px;
border: 1px solid red;
margin-bottom: 70px;
}
#box2{
width: 300px;
height: 300px;
border: 1px solid red;
margin-top: 50px;
}

#box3{
width: 300px;
height: 300px;
border: 1px solid red;
}
#box4{
width: 200px;
height: 200px;
border: 1px solid red;
margin-top: 50px;
}

#box5{
width: 200px;
height: 200px;
background: #000;
/*margin: auto;*/
margin-left: auto;
margin-right: auto;
}

</style>

</head>
<body>



<div id="box1"></div>
<div id="box2"></div>


---------------------------------

<div id="box3">
<div id="box4"></div>
</div>



<div id="box5"></div>

</body>
</html>

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