CSS之Box-shadow篇

前言

最近在忙活小程序开发以及网页设计工作，虽说忙活其实不然，东拼西凑缝缝补补搞一些自己能静下心来搞的东西，权当做消磨时间。这不，刚上手了一个box-shadow属性，小试牛刀，实现了很多让我出乎意料的样式。下面做一个深入的了解。

box-shadow的详解

inset：默认阴影在边框外。使用inset后，阴影在边框内（即使是透明边框），背景之上内容之下。
offset-x/y：设置阴影偏移量。x负责水平，y负责垂直，正值为→或↓。
blur-radius：模糊面积。值越大，阴影就越大越淡。默认为0，不可为负值。
spread-radius：正值是阴影扩大，负值时缩小，默认为0，阴影与元素同样大。
color：颜色。

下面效果实现中部分摘自网络，整合自己的思想加以修改排版。

常规效果

HTML代码：

<div class="flex">

  <div class="flex-item">

    <h3>内阴影示例</h3>

    <div class="box boxshadow1"></div>

  </div>

  <div class="flex-item">

    <h3>3边内影示例</h3>

    <div class="box boxshadow2"></div>

  </div>

  <div class="flex-item">

    <h3>外阴影示例</h3>

    <div class="box boxshadow3"></div>

  </div>

  <div class="flex-item">

    <h3>右下外阴影示例</h3>

    <div class="box boxshadow4"></div>

  </div>

  <div class="flex-item">

    <h3>扩大阴影示例</h3>

    <div class="box boxshadow5"></div>

  </div>

  <div class="flex-item">

    <h3>半透明阴影色示例</h3>

    <div class="box boxshadow6"></div>

  </div>

</div>

CSS代码：

.flex{display:flex;flex-wrap:wrap;} 

.flex-item{margin-right:30px;}

.box {  background-color: #CCCCCC; border-radius:10px; width: 200px; height: 200px;  }

.boxshadow1{ box-shadow:inset 0px 0px 5px 1px #000; }

.boxshadow2{ box-shadow:inset 0 1px 2px 1px #000; }

.boxshadow3{box-shadow:0 0 10px #000;}

.boxshadow4{box-shadow:2px 2px 5px #000;}

.boxshadow5{box-shadow:0 0 5px 15px #000;}

.boxshadow6{box-shadow: 12px 12px 2px 1px rgba(0, 0, 255, .2);}

在这里插入图片描述

单边阴影效果

HTML代码：

<div class="flex">

  <div class="flex-item">

    <h3>上边内阴影示例</h3>

    <div class="box boxshadow1"></div>

  </div>

  <div class="flex-item">

    <h3>右边内阴影示例</h3>

    <div class="box boxshadow2"></div>

  </div>

  <div class="flex-item">

    <h3>下边外阴影示例</h3>

    <div class="box boxshadow3"></div>

  </div>

  <div class="flex-item">

    <h3>右边外阴影示例</h3>

    <div class="box boxshadow4"></div>

  </div>

  <div class="flex-item">

    <h3>下边细线示例</h3>

    <div class="box boxshadow5"></div>

  </div>

</div>

CSS代码：

.flex{

display:flex;flex-wrap:wrap;

} 

.flex-item{

margin-right:30px;

}

.box { 

 background-color: #CCCCCC;  

width: 200px; height: 200px;  

}

.boxshadow1{ 

box-shadow:inset 0px 15px 10px -15px #000; 

}

.boxshadow2{

 box-shadow:inset -15px 0px  10px -15px #000;

}

.boxshadow3{

box-shadow:0px 12px 8px -12px #000;

 border-radius:10px;

 }

.boxshadow4{

box-shadow:3px 0 8px -4px #000;

}

.boxshadow5{ 

box-shadow: inset 0px -1px 0px 0px rgb(0, 0, 0) ;

}

在这里插入图片描述

双边边阴影及多重阴影效果

HTML代码：

<div class="flex">

  <div class="flex-item">

    <h3>上下边内阴影示例</h3>

    <div class="box boxshadow1"></div>

  </div>

  <div class="flex-item">

    <h3>左右边外阴影示例</h3>

    <div class="box boxshadow2"></div>

  </div>

  <div class="flex-item">

    <h3>多层阴影示例</h3>

    <div class="box boxshadow3"></div>

  </div>

</div>

CSS代码：

.flex{display:flex;flex-wrap:wrap;} 

.flex-item{margin-right:30px;}

.box { 

 background-color: #CCCCCC; 

 width: 200px; height: 200px;  

}

.boxshadow1{ 

  box-shadow:inset 0px 15px 15px -15px #000,

   inset 0px -15px 15px -15px #000; 

}

.boxshadow2{ 

  box-shadow:15px 0 15px -15px #000,

  -15px 0 15px -15px #000;

}

.boxshadow3{ border-radius:10px; 

  box-shadow:0px 0px 0px 3px #bb0a0a,

   0px 0px 0px 6px #2e56bf,

   0px 0px 0px 9px #ea982e;

}

在这里插入图片描述

其他一些有意思的阴影

1

HTML代码：

<div class="box11 shadow"></div>

CSS代码：

.box11 {

	width: 300px;

	height: 100px;

	background: #ccc;

	border-radius: 10px;

	margin: 10px;

}

.shadow {

	position: relative;

	max-width: 270px;

	box-shadow: 0px 1px 4px rgba(0,0,0,0.3),

	0px 0px 20px rgba(0,0,0,0.1) inset;

}

.shadow::before,

.shadow::after {

   content:"";

   position:absolute;

   z-index:-1;

}

.shadow::before,

.shadow::after {

   content:"";

   position:absolute;

   z-index:-1;

   bottom:15px;

   left:10px;

   width:50%;

   height:20%;

}

.shadow::before,

.shadow::after {

   content:"";

   position:absolute;

   z-index:-1;

   bottom:15px;

   left:10px;

   width:50%;

   height:20%;

   box-shadow:0 15px 10px rgba(0, 0, 0, 0.7);

   transform:rotate(-3deg);

}

.shadow::after{

   right:10px;

   left:auto;

   transform:rotate(3deg);

 }

在这里插入图片描述

2

HTML代码：

<div class="wrap">

  <div class="box box1 shadow1">

    <h3>Shadow 1</h3>

  </div>

  <div class="box box2 shadow2">

    <h3>Shadow 2</h3>

  </div>

  <div class="box box3 shadow3">

    <h3>Shadow 3</h3>

  </div>

  <div class="box box4 shadow4">

    <h3>Shadow 4</h3>

  </div>

  <div class="box box5 shadow5">

    <h3>Shadow 5</h3>

  </div>

  <div class="box box6 shadow6">

    <h3>Shadow 6</h3>

  </div>

  <div class="box box7 shadow7">

    <h3>Shadow 7</h3>

  </div>

  <div class="box box8 shadow8">

    <h3>Shadow 8</h3>

  </div>

</div>

CSS代码：

body{

  background:#E6EEF6;

}

.wrap{

  margin-left:20px;

}

.box{

  width:40%;

  height:200px;

  float:left;

  background-color:white; 

  margin:25px 15px;

  border-radius:5px;

}

.box h3{

  font-family: 'Didact Gothic', sans-serif;

  font-weight:normal;

  text-align:center;

  padding-top:60px;

  color:#fff;

}

.box1{

  background-color: #EBA39E;

}

.box2{

  background-color: #EDE89A;

}

.box3{

  background-color: #9EEBA1;

}

.box4{

  background-color: #9EEBBF;

}

.box5{

  background-color: #9ED9EB;

}

.box6{

  background-color: #9EB3EB;

}

.box7{

  background-color: #DB9EEB;

}

.box8{

  background-color: #C49EEB;

}

.shadow1, .shadow2, .shadow3,.shadow4,.shadow5,.shadow6,.shadow7,.shadow8{

  position:relative;

}

.shadow1,.shadow2,.shadow3,.shadow4,.shadow5,.shadow6,.shadow7,.shadow8{

    box-shadow:0 1px 4px rgba(0, 0, 0, 0.3), 0 0 20px rgba(0, 0, 0, 0.1) inset;

}

/*****************************************************************dashed border

****************************************************************/

.shadow1 h3, .shadow2 h3, .shadow3 h3, .shadow4 h3, .shadow5 h3, .shadow6 h3, .shadow7 h3, .shadow8 h3{

  width:87%;

  height:100px;

  margin-left:6%;

  border:2px dashed #F7EEEE;

  border-radius:5px;

}

/****************************************************************

*styling shadows

****************************************************************/

.shadow1:before, .shadow1:after{

  position:absolute;

  content:"";

  bottom:12px;left:15px;top:80%;

  width:45%;

  background:#9B7468;

  z-index:-1;

  -webkit-box-shadow: 0 20px 15px #9B7468;

  -moz-box-shadow: 0 20px 15px #9B7468;

  box-shadow: 0 20px 15px #9B7468;

  -webkit-transform: rotate(-6deg);

  -moz-transform: rotate(-6deg);

  transform: rotate(-6deg);

}

.shadow1:after{

  -webkit-transform: rotate(6deg);

  -moz-transform: rotate(6deg);

  transform: rotate(6deg);

  right: 15px;left: auto;

}

.shadow2:before{

  position:absolute;

  content:"";

  width:80%;

  top:140px;bottom:15px;left:30px;

  background-color:#9F8641;

  z-index:-1;

  -webkit-box-shadow:0 23px 17px 0 #9F8641;

  -moz-box-shadow:0 23px 17px 0 #9F8641;

  box-shadow: 0 23px 17px 0 #9F8641;

  -webkit-transform:rotate(-4deg);

  -moz-transform:rotate(-4deg);

  transform:rotate(-4deg);

}

.shadow3:before, .shadow3:after{

  content:"";

  position:absolute;

  bottom:0;top:2px;left:15px;right:15px;

  z-index:-1;

  border-radius:100px/30px;

 -webkit-box-shadow:0 0 30px 2px #479F41;

  -moz-box-shadow:0 0 30px 2px #479F41;

  box-shadow: 0 0 30px 2px #479F41;

}

.shadow4:before, .shadow4:after{

  position:absolute;

  content:"";

  top:14px;bottom:14px;left:0;right:0;

  box-shadow:0 0 25px 3px #548E7F;

  border-radius:100px/10px;

  z-index:-1;

}

.shadow5:before, .shadow5:after{

  position:absolute;

  content:"";

  box-shadow:0 10px 25px 20px #518C96;

  top:40px;left:10px;bottom:50px;

  width:15%;

  z-index:-1;

  -webkit-transform: rotate(-8deg);

  -moz-transform: rotate(-8deg);

  transform: rotate(-8deg);

}

.shadow5:after{

  -webkit-transform: rotate(8deg);

  -moz-transform: rotate(8deg);

  transform: rotate(8deg);

  right: 10px;left: auto;

}

.shadow6:before, .shadow6:after{

  position:absolute;

  content:"";

  top:100px;bottom:5px;left:30px;right:30px;

  z-index:-1;

  box-shadow:0 0 40px 13px #486685;

  border-radius:100px/20px; 

}

.shadow7:before, .shadow7:after{

  position:absolute;

  content:"1";

  top:25px;left:20px;bottom:150px;

  width:80%;

  z-index:-1;

  -webkit-transform: rotate(-6deg);

  -moz-transform: rotate(-6deg);

  transform: rotate(-6deg);

}

.shadow7:before{

  box-shadow:10px -10px 30px 15px #984D8E;

}

.shadow7:after{

  -webkit-transform: rotate(7deg);

  -moz-transform: rotate(7deg);

  transform: rotate(7deg);

  bottom: 25px;top: auto;

  box-shadow:10px 10px 30px 15px #984D8E;

}

.shadow8{

  box-shadow:

 -6px -6px 8px -4px rgba(250,254,118,0.75),

  6px -6px 8px -4px rgba(254,159,50,0.75),

  6px 6px 8px -4px rgba(255,255,0,0.75),

  6px 6px 8px -4px rgba(0,0,255,2.75);

}

在这里插入图片描述

3

HTML代码：

<div></div>

CSS代码：

body {

  background-color: #000;

}



div {

  position: absolute;

  top: calc(50% - 150px);

  left: calc(50% - 150px);

  width: 300px;

  height: 300px;

  border-radius: 50%;

  box-shadow:

    inset 0 0 50px #fff,

    inset 20px 0 80px #f0f,

    inset -20px 0 80px #0ff,

    inset 20px 0 300px #f0f,

    inset -20px 0 300px #0ff,

    0 0 50px #fff,

    -10px 0 80px #f0f,

    10px 0 80px #0ff;

}

在这里插入图片描述

4

HTML代码：

<div></div>

CSS代码：

body {

  margin: 0;

  background-color: #000;

}

div {

  position: absolute;

  top: calc(50% - 100px);

  left: calc(50% - 200px);

  width: 400px;

  height: 200px;

  background-color: #fff;

  border: solid 1px #fff;

  box-shadow:

    inset 60px 0 120px #f0f,

    inset -60px 0 120px #0ff;

}

在这里插入图片描述

5

HTML代码：

<div></div>

CSS代码：

body {

  margin: 0;

  background-color: #000;

}



div {

  position: absolute;

  top: calc(50% - 20px);

  left: calc(50% - 20px);

  width: 40px;

  height: 40px;

  border-radius: 50%;

  background-color: #fff;

  box-shadow:

    0 0 60px 30px #fff,

    0 0 100px 60px #f0f,

    0 0 140px 90px #0ff;

}