CSS3 implements special shadow (study notes)_html/css

CSS3 implements special shadow (study notes)_html/css_WEB-ITnose

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Release： 2016-06-24 11:49:40

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Learning source: MOOC http://www.imooc.com/view/240

Look at the renderings first↓↓↓↓↓↓↓↓↓↓↓↓ ↓↓↓↓↓↓↓↓↓

HTML structure

 1 <body> 2     <div class="wrap effect">     3     <!-- effect类:是阴影类,其他元素也可以使用 --> 4         <h1>Shadow Effect</h1> 5     </div> 6     <ul class="box"> 7         <li><img src="images/photo1.jpg" alt=""></li> 8         <li><img src="images/photo2.jpg" alt=""></li> 9         <li><img src="images/photo3.jpg" alt=""></li>10     </ul>11 </body>

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CSS style (each browser prefix is omitted)

 1 /*通用类*/ 2 body { font-family: Arial; font-size: 20px;} 3 body,ul {margin: 0; padding: 0; list-style: none;} 4 .wrap {width:70%; height:200px; margin:50px auto; background: #fff; } 5 .wrap h1 {font-size: 20px; text-align: center; line-height: 200px; } 6  7 /*弧度阴影*/ 8 .effect {  9     position: relative;10     box-shadow: 0px 1px 4px rgba(0,0,0,0.3),11     0 0 10px rgba(0,0,0,0.1) inset; 12     /*添加一个范围=4px的小阴影;再添加一个范围=10px的内阴影;*/13 }14 .effect:before,.effect:after {15     content: '';16     background: #f00;17     position: absolute;18     z-index: -2;19     top:50%; bottom:0; left:30px; right:30px;20     /*设置四个方向值,然后浏览器自动计算盒子的大小;*/21     box-shadow: 0px 0px 20px rgba(0,0,0,0.8);22     /*设置添加的盒子的阴影;*/23     border-radius: 100px/10px;24     /*添加圆角:水平方向圆角大小是100px/垂直方向圆角大小是10px;*/25 }26 27 /*翘边阴影*/28 .box{29     width:980px;30     height:auto;31     clear:both;32     overflow:hidden;33     margin:20px auto;34 }35 .box li{36     position: relative;37     /*以li为定位基准;*/38     width:300px;39     height:210px;40     float:left;41     background: #fff;42     margin:20px 10px;43     border:2px solid #efefef;44     box-shadow: 0px 1px 4px rgba(0,0,0,0.27);45     /*给li添加一个小小的阴影;*/46 }47 .box li img {48     display: block;49     width:290px;50     height:200px;51     margin:5px;52 }53 .box li:before{54     content: '';55     position: absolute;56     z-index: -3;57     width:90%;58     height:80%;59     left:18px;60     bottom:8px;61     box-shadow: 0px 8px 20px rgba(0,0,0,0.6);62     transform:skew(-12deg) rotate(-4deg);63     /*图形向右倾斜12度;并逆时针旋转4度;*/64 }65 .box li:after{66     content: '';67     position: absolute;68     z-index: -4;69     width:90%;70     height:80%;71     right:18px;72     bottom:8px;73     box-shadow: 0px 8px 20px rgba(0,0,0,0.6);74     transform:skew(12deg) rotate(4deg);75     /*图形向左倾斜12度;并顺时针旋转4度;*/76 }

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Previously, I used a gray layer to overlay under other layers in PS to create a special shadow effect. The same idea was applied to CSS. praise!

Supplementary knowledge points↓↓↓↓↓↓↓

 1 1.box-shadow--添加一个或多个阴影 2     >1.功能:box-shadow--添加一个或多个阴影; 3     >2.语法:box-shadow:h-shadow v-shadow blur spread color inset; 4     >3.参数: 5         >>:h-shadow(必需):水平阴影的位置;允许负值; 6         >>:v-shadow(必需):垂直阴影的位置;允许负值; 7         >>:blur(可选):模糊距离; 8         >>:spread(可选):阴影的尺寸; 9         >>:color(可选):阴影的颜色;10         >>:inset(可选):将外部阴影(outset)改为内部阴影;11     >4.浏览器:IE9+/FF412 13 2.:before与:after 14     >1.:before选择器:在被选元素的内容前面插入内容;15     >2.:after选择器:在被选元素的内容后面插入内容;16     >3.说明:需要使用content属性来指定要插入的内容;17     >4.浏览器:IE8及更早版本中的:after,必须使用<!DOCTYPE>;18 19 3.transform--20     >1.功能:向元素应用2D或3D转换21     >1.语法:transform:none | transform-functions22     >2.参数:23         >>:skew(x-angle,y-angle):定义沿着X和Y轴的2D倾斜转换;24         >>:skewX(angle):定义沿着X轴的2D倾斜转换;25         >>:skewY(angle):定义沿着Y轴的2D倾斜转换;

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