为什么效果出不来呢？哪里的问题，有没有人可以解答一下
<!doctype html>
<html>
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>
body {
margin-top: 5em;
text-align: center;
color: #414142;
background: rgb(246,241,232);
任务一、制作多背景
background-image: radial-gradient( farthest-side ellipse at center, rgba(246,241,232,.85) 39%,rgba(212,204,186,.5) 100%), url("http://fs0.139js.com/file/s_jpg_857b081bjw1du3kveu19sj.jpg");
任务二、控制背景图像尺寸
background-size:cover;
}
h1, em, #information {
display: block;
font-size: 25px;
font-weight: normal;
margin: 2em auto;
}
a {
color: #414142;
font-style: normal;
text-decoration: none;
font-size: 20px;
}
a:hover {
text-decoration: underline;
}
#container {
margin: 0 auto;
width: 1024px;
}
.wrapper {
display: inline-block;
width: 310px;
height: 100px;
vertical-align: top;
margin: 1em 1.5em 2em 0;
cursor: pointer;
position: relative;
font-family: Tahoma, Arial;
-webkit-perspective: 4000px;
-moz-perspective: 4000px;
-ms-perspective: 4000px;
-o-perspective: 4000px;
perspective: 4000px;
}
.item {
height: 100px;
-webkit-transform-style: preserve-3d;
-moz-transform-style: preserve-3d;
-ms-transform-style: preserve-3d;
-o-transform-style: preserve-3d;
transform-style: preserve-3d;
任务三、给每个列表项添加过渡动画效果
-webkit-transition: -webkit-transform .6s;
}
.item:hover {
任务四、悬浮状态改变每个列表项的transform效果
-webkit-transform:translateZ(-50px) rotateX(90deg);
}
.item img {
display: block;
position: absolute;
top: 0;
任务五、设置列表项图片的圆角和阴影效果
-webkit-transform: translateZ(50px);
-moz-transform: translateZ(50px);
-ms-transform: translateZ(50px);
-o-transform: translateZ(50px);
transform: translateZ(50px);
-webkit-transition: all .6s;
-moz-transition: all .6s;
-ms-transition: all .6s;
-o-transition: all .6s;
transform: translateZ(50px);
-webkit-transition: all .6s;
-moz-transition: all .6s;
-ms-transition: all .6s;
-o-transition: all .6s;
transition: all .6s;
width: 310px;
height: 100px;
}
.item .information {
display: block;
position: absolute;
top: 0;
height: 80px;
width: 290px;
text-align: left;
border-radius: 15px;
padding: 10px;
font-size: 12px;
text-shadow: 1px 1px1px rgba(255,255,255,0.5);
box-shadow: none;
background: rgb(236,241,244);
任务六、给底层显示文本的层级设置渐变效果
background:linear-gradient(to bottom,#fff,#3ef);
-webkit-transform: rotateX(-90deg) translateZ(50px);
-moz-transform: rotateX(-90deg) translateZ(50px);
-ms-transform: rotateX(-90deg) translateZ(50px);
-o-transform: rotateX(-90deg) translateZ(50px);
transform: rotateX(-90deg) translateZ(50px);
-webkit-transition: all .6s;
-moz-transition: all .6s;
-ms-transition: all .6s;
-o-transition: all .6s;
transition: all .6s;
}
.information strong {
display: block;
margin: .2em 0 .5em 0;
font-size: 20px;
font-family: "Oleo Script";
}
.item:hover img {
任务七、列表项悬浮状态时，去掉图片的阴影效果
-webkit-box-shadow:none;
border-radius: 15px;
}
.item:hover .information {
box-shadow: 0px 3px 8px rgba(0,0,0,0.3);
border-radius: 3px;
}
</style>
</head>
<body>
<div id="container">
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