body的背景为什么做不出来呢-慕课网

body的背景为什么做不出来呢

来源：12-4 制作3D旋转视频展示区
Arrogance_J
2015-11-02 10:08
<!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:url(http://fs0.139js.com/file/s_jpg_857b081bjw1du3kveu19sj.jpg);
            background-image:-webkit-radial-gradient(farthest-side ellipse at center,rgba(246,241,232,.85)39%,rgba(212,204,186,.5)100%);
        /*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 linear;
        }
        
        .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*/
            border-radius:18px;
            box-shadow: 0px 3px 8px red;
            
        
        -webkit-transform: translateZ(50px);
           -moz-transform: translateZ(50px);
           -ms-transform: translateZ(500px);
           -o-transform: translateZ(50px);
           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: -webkit-linear-gradient(to bottom,  rgba(236,241,244,1) 0%,rgba(190,202,217,1) 100%);
             background: linear-gradient(to bottom,  rgba(236,241,244,1) 0%,rgba(190,202,217,1) 100%);
            
            -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*/
            border-radius: 18px;
            box-shadow:none;
        }
        
        .item:hover .information {
            box-shadow: 0px 3px 8px rgba(0,0,0,0.3);
            border-radius: 3px;
         }
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