display
可以使得行内元素和块元素相互转换，但不常用，用float！
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style>
/*
inline:
block:
inline-block:
*/
div{
width: 100px;
height: 100px;
border: red 1px solid;
display: inline-block;
}
span{
width: 100px;
height: 100px;
border: red 1px solid;
display: inline-block;
}
</style>
</head>
<body>
<div>div</div>
<span>span</span>
</body>
</html>
浮动 float
使得元素浮起来，分层次。
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style>
.d1{
width: 100px;
height: 100px;
border: red 1px solid;
display: inline-block;
float: left;
}
.d2{
width: 100px;
height: 100px;
border: red 1px solid;
display: inline-block;
float: right;
}
/*clear: both:变成块元素了;*/
.d3{
width: 100px;
height: 100px;
border: red 1px solid;
display: inline-block;
float: right;
clear: both;
}
</style>
</head>
<body>
<div>
<div class="d1"><img src="images/爱莉希雅.jpg" alt="">d1</div>
<div class="d2"><img src="images/爱莉希雅.jpg" alt="">d2</div>
<div class="d3"><img src="images/爱莉希雅.jpg" alt="">d3</div>
</div>
</body>
</html>