CSS 是我们使用的功能强大和最常用 web 语言。他可以兼容新旧不同的浏览器，他的兼容跨度确实够大的，从微软的IE到火狐再到谷歌浏览器。在设计的时候我们总是想创建更有创意和风格的网站，无论创建怎么样的网站，有些CSS代码是必须要掌握的，可以说这是核心，掌握这样的一些CSS代码，前端布局方面基本上再不成问题，什么边框圆角，工具提示，浏览器hacks等等都不是问题。

在今天的文章中分享我收藏的 30 个CSS 代码段，无论您是经验丰富的 web 设计师还是新手，他们都是非常值得借鉴的。

Css Reset by Eric Meyer

html, body, div, span, applet, object, iframe,
h1, h2, h3, h4, h5, h6, p, blockquote, pre,
a, abbr, acronym, address, big, cite, code,
del, dfn, em, font, img, ins, kbd, q, s, samp,
small, strike, strong, sub, sup, tt, var,
b, u, i, center,
dl, dt, dd, ol, ul, li,
fieldset, form, label, legend,
table, caption, tbody, tfoot, thead, tr, th, td {
margin: 0;
padding: 0;
border: 0;
outline: 0;
font-size: 100%;
vertical-align: baseline;
background: transparent;
}

body {
line-height: 1;
}

ol, ul {
list-style: none;
}

blockquote, q {
quotes: none;
}

blockquote:before, blockquote:after,
q:before, q:after {
content: '''''''''''''''';
content: none;
}

/* remember to define focus styles! */
:focus {
outline: 0;
}

/* remember to highlight inserts somehow! */
ins {
text-decoration: none;
}

del {
text-decoration: line-through;
}

/* tables still need ''''''''cellspacing="0"'''''''' in the markup */
table {
border-collapse: collapse;
border-spacing: 0;
}

根据文件格式显示不同的链接样式

/* external links */
a[href^="http://"]{
padding-right: 20px;
background: url(external.gif) no-repeat center right;
}

/* emails */
a[href^="mailto:"]{
padding-right: 20px;
background: url(email.png) no-repeat center right;
}

/* pdfs */
a[href$=".pdf"]{
padding-right: 20px;
background: url(pdf.png) no-repeat center right;
}

在IE浏览器删除textarea的滚动条

textarea{
overflow:auto;
}

浏览器特定的 hacks

/* IE 6 */
* html .yourclass { }

/* IE 7 */
*+html .yourclass{ }

/* IE 7 and modern browsers */
html>body .yourclass { }

/* Modern browsers (not IE 7) */
html>/**/body .yourclass { }

/* Opera 9.27 and below */
html:first-child .yourclass { }

/* Safari */
html[xmlns*=""] body:last-child .yourclass { }

/* Safari 3+, Chrome 1+, Opera 9+, Fx 3.5+ */
body:nth-of-type(1) .yourclass { }

/* Safari 3+, Chrome 1+, Opera 9+, Fx 3.5+ */
body:first-of-type .yourclass {  }

/* Safari 3+, Chrome 1+ */
@media screen and (-webkit-min-device-pixel-ratio:0) {
.yourclass  {  }
}

Clearfix

.clearfix:after {
visibility: hidden;
display: block;
font-size: 0;
content: " ";
clear: both;
height: 0;
}

.clearfix { display: inline-block; }

/* start commented backslash hack \*/
* html .clearfix { height: 1%; }
.clearfix { display: block; }
/* close commented backslash hack */

固定宽度且居中

.wrapper {
width:960px;
margin:0 auto;
}

Rounded corners – border-radius

.round{
-moz-border-radius: 10px;
-webkit-border-radius: 10px;
border-radius: 10px; /* future proofing */
-khtml-border-radius: 10px; /* for old Konqueror browsers */
}

伪元素向文本的第一个字母添加特殊样式

p:first-letter{
display:block;
margin:5px 0 0 5px;
float:left;
color:#000;
font-size:60px;
font-family:Georgia;
}

使用 @fontface

@font-face {
font-family: ''''''''MyFontFamily'''''''';
src: url(''''''''myfont-webfont.eot?'''''''') format(''''''''eot''''''''),
url(''''''''myfont-webfont.woff'''''''') format(''''''''woff''''''''),
url(''''''''myfont-webfont.ttf'''''''')  format(''''''''truetype''''''''),
url(''''''''myfont-webfont.svg#svgFontName'''''''') format(''''''''svg'''''''');
}

跨浏览器的inline-block

li {
width: 200px;
min-height: 250px;
border: 1px solid #000;
display: -moz-inline-stack;
display: inline-block;
vertical-align: top;
margin: 5px;
zoom: 1;
*display: inline;
_height: 250px;
}

Fixed Footer

#footer {
position:fixed;
left:0px;
bottom:0px;
height:30px;
width:100%;
background:#999;
}

/* IE 6 */
* html #footer {
position:absolute;
top:expression((0-(footer.offsetHeight)+(document.documentElement.clientHeight ? document.documentElement.clientHeight : document.body.clientHeight)+(ignoreMe = document.documentElement.scrollTop ? document.documentElement.scrollTop : document.body.scrollTop))+''''''''px'''''''');
}

更改内容区域的大小

#content {
width: 100%;
margin: 0;
float: none;
}

CSS3 Media Queries （这个不常用主要用于智能设备的判断显示不同的媒体）

/* Smartphones (portrait and landscape) - */
@media only screen
and (min-device-width : 320px)
and (max-device-width : 480px) {
/* Styles */
}

/* Smartphones (landscape) - */
@media only screen
and (min-width : 321px) {
/* Styles */
}

/* Smartphones (portrait) - */
@media only screen
and (max-width : 320px) {
/* Styles */
}

/* iPads (portrait and landscape) - */
@media only screen
and (min-device-width : 768px)
and (max-device-width : 1024px) {
/* Styles */
}

/* iPads (landscape) - */
@media only screen
and (min-device-width : 768px)
and (max-device-width : 1024px)
and (orientation : landscape) {
/* Styles */
}

/* iPads (portrait) - */
@media only screen
and (min-device-width : 768px)
and (max-device-width : 1024px)
and (orientation : portrait) {
/* Styles */
}

/* Desktops and laptops - */
@media only screen
and (min-width : 1224px) {
/* Styles */
}

/* Large screens - */
@media only screen
and (min-width : 1824px) {
/* Styles */
}

/* iPhone 4 - */
@media
only screen and (-webkit-min-device-pixel-ratio : 1.5),
only screen and (min-device-pixel-ratio : 1.5) {
/* Styles */
}

多背景图片

#multiple-images {
background: url(image_1.png) top left no-repeat,
url(image_2.png) bottom left no-repeat,
url(image_3.png) bottom right no-repeat;
}

多列

#columns-3 {
text-align: justify;
-moz-column-count: 3;
-moz-column-gap: 12px;
-moz-column-rule: 1px solid #c4c8cc;
-webkit-column-count: 3;
-webkit-column-gap: 12px;
-webkit-column-rule: 1px solid #c4c8cc;
}

在IE的最小高度

.box {
min-height:500px;
height:auto !important;
height:500px;
}

突出显示文本样式

::selection {
color: #000000;
background-color: #FF0000;
}

::-moz-selection {
color: #000000;
background: #FF0000;
}

Box Shadow

box-shadow: 0px 3px 3px rgba(0,0,0,0.2);
-moz-box-shadow: 0px 3px 3px rgba(0,0,0,0.2);
-webkit-box-shadow: 0px 3px 3px rgba(0,0,0,0.2);

占位符文本样式

::-webkit-input-placeholder { color: #ccc; font-style:italic }
:-moz-placeholder           { color: #ccc; font-style:italic }

CSS3 3D文字效果

h1 {
text-shadow: 0 1px 0 #ccc,
0 2px 0 #c9c9c9,
0 3px 0 #bbb,
0 4px 0 #b9b9b9,
0 5px 0 #aaa,
0 6px 1px rgba(0,0,0,.1),
0 0 5px rgba(0,0,0,.1),
0 1px 3px rgba(0,0,0,.3),
0 3px 5px rgba(0,0,0,.2),
0 5px 10px rgba(0,0,0,.25),
0 10px 10px rgba(0,0,0,.2),
0 20px 20px rgba(0,0,0,.15);
}

WebKit的边界半径修正

-webkit-background-clip: padding-box;

XBrowser的border-radius（CSS3PIE）

.roundbox {
-moz-border-radius:8px;
-webkit-border-radius:8px;
-khtml-border-radius:8px;
border-radius:8px;
behavior: url(/PIE.htc);
}

更好的兼容IE浏览器的





CSS3工具提示（这个很实用，看我网站的导航工具提示效果)

a {
color: #900;
text-decoration: none;
}

a:hover {
color: red;
position: relative;
}

a[title]:hover:after {
content: attr(title);
padding: 4px 8px;
color: #333;
position: absolute;
left: 0;
top: 100%;
white-space: nowrap;
z-index: 20px;
-moz-border-radius: 5px;
-webkit-border-radius: 5px;
border-radius: 5px;
-moz-box-shadow: 0px 0px 4px #222;
-webkit-box-shadow: 0px 0px 4px #222;
box-shadow: 0px 0px 4px #222;
background-image: -moz-linear-gradient(top, #eeeeee, #cccccc);
background-image: -webkit-gradient(linear,left top,left bottom,color-stop(0, #eeeeee),color-stop(1, #cccccc));
}

CSS3背景大小

body {
background: #000 url(http://birdoflight.files.wordpress.com/2009/10/frida-kahlo-1.jpg) center center fixed no-repeat;
-moz-background-size: cover;
background-size: cover;
}

@media only all and (max-width: 1024px) and (max-height: 768px) {
body {
-moz-background-size: 1024px 768px;
background-size: 1024px 768px;
}
}

跨浏览器的CSS页面卷曲阴影

.page-curl {
position: relative;
background: #ffffff;
background: -moz-linear-gradient(top, #ffffff 0%, #e5e5e5 100%);
background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,#ffffff), color-stop(100%,#e5e5e5));
filter: progid:DXImageTransform.Microsoft.gradient( startColorstr=''''''''#ffffff'''''''', endColorstr=''''''''#e5e5e5'''''''',GradientType=0 );
-webkit-box-shadow: 0px 0px 3px rgba(0, 0, 0, 0.3);
-moz-box-shadow: 0px 0px 3px rgba(0, 0, 0, 0.3); }

.page-curl:after {
z-index: -1;
position: absolute;
background: transparent;
width: 70%;
height: 55%;
content: '''''''''''''''';
right: 10px;
bottom: 10px;
-webkit-transform: skew(15deg) rotate(5deg);
-webkit-box-shadow: 8px 12px 10px rgba(0, 0, 0, 0.3);
-moz-transform: skew(15deg) rotate(5deg);
-moz-box-shadow: 8px 12px 10px rgba(0, 0, 0, 0.3); }

.page-curl:before {
z-index: -2;
position: absolute;
background: transparent;
width: 70%;
height: 55%;
content: '''''''''''''''';
left: 10px;
bottom: 10px;
-webkit-transform: skew(-15deg) rotate(-5deg);
-webkit-box-shadow: -8px 12px 10px rgba(0, 0, 0, 0.3);
-moz-transform: skew(-15deg) rotate(-5deg);
-moz-box-shadow: -8px 12px 10px rgba(0, 0, 0, 0.3); }

CSS3模糊文字

.blur {
color: transparent;
text-shadow: 0 0 5px rgba(0,0,0,0.5);
}

修复 IE6/7 margin/padding双倍 间距错误

ul li
{
float: right;
margin-right: 10px;
*display: inline; /*Target IE7 and bellow*/
_display: inline; /*Target IE6 and bellow*/
}
/* This example fixes the double right margin bug */

链接伪类的顺序

a:link {color: blue;}
a:visited {color: purple;}
a:hover {color: red;}
a:active {color: yellow;}

响应布局的HTML Meta标签