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CSS伪元素 :before :after

2016-09-02 10:53 246 查看
1、八卦制作

转载自:http://www.hulufei.com/post/about-before-and-after-pseudo-element

css:

#ba{
width: 96px;
height: 48px;
background: #eee;
border-color: red;
border-style: solid;
border-width: 2px 2px 50px 2px;
border-radius: 100%;
position: relative;
}
#ba:after,#ba:before{
content: '';
position: absolute;
top: 50%;
width: 12px;
height: 12px;
border-radius: 100%;
}
#ba:after{
border: 18px solid red;
left: 0;
background: #eee;
}
#ba:before{
border: 18px solid #eee;
right: 0;
background: red;
}


html:

<div id="ba"></div>


效果:


2、阴影制作

转载自https://paulund.co.uk/playground/demo/css_box_shadow/sass-box-shadow.php

css:

body{
background: #eee;
}
div.box{
width: 50%;
height: 200px;
background: #FFF;
margin: 40px auto;
position: relative;
}
div.box:before,div.box:after{
position: absolute;
content: "";
bottom: 15px;
top: 80%;
width: 50%;
background: #777;
box-shadow: 0 15px 10px #777;
z-index: -1;
}
div.box:before{
left: 10px;
transform: rotate(-3deg);
}
div.box:after{
right: 10px;
transform: rotate(3deg);
}


html:

<div class="box"></div>


效果:


3、左右阴影

body{
background: #eee;
}
div.box{
width: 50%;
height: 200px;
background: #FFF;
margin: 40px auto;
position: relative;
box-shadow: 0 1px 4px rgba(0, 0, 0, 0.3), 0 0 40px rgba(0, 0, 0, 0.1) inset;
}
div.box:before{
content: "";
position: absolute;
box-shadow: 0 0 20px rgba(0, 0, 0, 0.8);
top: 10px;
bottom: 10px;
left: 0;
right: 0;
border-radius: 100px / 10px;
z-index: -1;
}
div.box:after{
right: 10px;
left: auto;
transform: skew(8deg) rotate(3deg);
}


效果:


3、上下阴影

body{
background: #eee;
}
div.box{
width: 50%;
height: 200px;
background: #FFF;
margin: 40px auto;
position: relative;
box-shadow: 0 1px 4px rgba(0, 0, 0, 0.3), 0 0 40px rgba(0, 0, 0, 0.1) inset;
}
div.box:before{
content: "";
position: absolute;
box-shadow: 0 0 20px rgba(0, 0, 0, 0.8);
top: 0;
bottom: 0;
left: 10px;
right: 10px;
border-radius: 100px / 10px;
z-index: -1;
}
div.box:after{
right: 10px;
left: auto;
transform: skew(8deg) rotate(3deg);
}


效果:
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