Css Reset by Eric Meyer
URL:http://www.ahrefmagazine.com/web-design/30-useful-css-snippets-for-developers

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;
}





Style links depending on file format
/* 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;
}




Remove textarea scrollbar in IE
textarea{
	overflow:auto;
}




Browser specific 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 */




Center the website
.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 */
}



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



Using @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‘);
    }



Cross Browser 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‘);
}



Changing the size of your content area
#content {
    width: 100%;
    margin: 0;
    float: none;
}



CSS3 Media Queries
/* 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 */
}



Multiple Background Images
#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;
}



Multiple Columns
#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;
}



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



Highlight Text Selection
::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);



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



CSS3 3D Text
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 border radius fix
-webkit-background-clip: padding-box;



XBrowser Border-radius (CSS3PIE)
.roundbox {
-moz-border-radius:8px;
-webkit-border-radius:8px;
-khtml-border-radius:8px;
border-radius:8px;
behavior: url(/PIE.htc);
}



Better IE compatibility
<!--[if IE]>
<script src="http://html5shim.googlecode.com/svn/trunk/html5.js"></script>
<![endif]-->



CSS3 Tooltips
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 background-size
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;
  }
}



Cross Browser CSS Page Curl Shadow
.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 Blurry Text
.blur {
   color: transparent;
   text-shadow: 0 0 5px rgba(0,0,0,0.5);
}



Fix IE6/7 double margin/padding bug
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 */



The order of link pseudo-classes
a:link {color: blue;}
a:visited {color: purple;}
a:hover {color: red;}
a:active {color: yellow;}



7. HTML Meta Tags for Responsive Layouts
<meta name="viewport" content="width=device-width,initial-scale=1,maximum-scale=1,user-scalable=no">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<meta name="HandheldFriendly" content="true">

//table-cell的居中就是这么简单
.container{
　　min-height: 6.5em;
　　display: table-cell;
　　vertical-align: middle;
　　height:400px;
}

#colorbox {

　　/*渐变 linear-graident(top,#color,#color)*/

　　background: #629721;

　　background-image: -webkit-gradient(linear, left top, left bottom, from(#83b842), to(#f00));
　　background-image: -webkit-linear-gradient(top, #83b842, #f00);
　　background-image: -moz-linear-gradient(top, #83b842, #f00);
　　background-image: -ms-linear-gradient(top, #83b842, #f00);
　　background-image: -o-linear-gradient(top, #83b842, #f00);
　　background-image: linear-gradient(top, #83b842, #f00);

/*love*/

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

 

 

/* 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 */
}