<html>
<head>
<meta charset="utf-8">
<title>TEST</title>
<style>
.grid {
display: table
transform:rotate(-45deg)
margin: 0 auto
}
.grid > .grid-tr {
display: table-row
}
.grid > .grid-tr > .grid-td {
display: table-cell
width: 120px
height: 120px
border: 2px solid rgba(255,255,255,1)
background-color: aqua
}
</style>
</head>
<body>
<div class="grid">
<div class="grid-tr">
<div class="grid-td"></div>
</div>
<div class="grid-tr">
<div class="grid-td"></div>
<div class="grid-td"></div>
</div>
<div class="grid-tr">
<div class="grid-td"></div>
<div class="grid-td"></div>
<div class="grid-td"></div>
</div>
<div class="grid-tr">
<div class="grid-td"></div>
<div class="grid-td"></div>
<div class="grid-td"></div>
<div class="grid-td"></div>
</div>
</div>
</body>
</html>
想放图片的话直接将 img标签放到 grid-td的div里面去。
思路很简单，看似不规则的排列实际是规则的，与其一个一个将div旋转，不如放入一个容器里面排列好，然后旋转了-45° 。
百度：css3 变形(低版本ie和少部分浏览器不支持)
低版本ie的实现：
先把图片在ps里面拉斜做影子后存为：png24+背景透明格式，然后网页里面用cssz-index控制层级上下关系，并用定位摆放到合适的位置。另外你还要修正一下ie6的png24背景不透明的问题。
然后，你给那三个猫咪图片每张一个id：
<img src="aaa.jpg" id="cat1" />
<img src="bbb.jpg" id="cat2" />
<img src="ccc.jpg" id="cat3" />
#cat1,#cat2,#cat3{position:absolute}/*绝对定位*/
#cat1{
left:300pxtop:80px
z-index:10
}
#cat2{
left:50pxtop:320px
z-index:9
}
#cat3{
left:300pxtop:80px
z-index:8
}
<!DOCTYPE html><html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style>
html, body{margin: 0 padding: 0}
.box{margin: 0 auto width: 400px transform: rotate(-45deg)}
span{display: inline-block width: 50px height: 50px margin: 0 1px 2px 0 background-color: lightblue transition: 1s}
span:hover{transform: scale(3) background-color: red}
</style>
</head>
<body>
<div class="box">
<div>
<span></span>
</div>
<div>
<span></span>
<span></span>
</div>
<div>
<span></span>
<span></span>
<span></span>
</div>
<div>
<span></span>
<span></span>
<span></span>
<span></span>
</div>
<div>
<span></span>
<span></span>
<span></span>
<span></span>
<span></span>
</div>
</div>
</body>
</html>
代码实现的是不规则排列和鼠标滑过放大，至于点击出现左右箭头切换就要用到JS了
