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