30+有用的CSS代码片段

.vc{
    position: relative;
    top: 50%;
    -webkit-transform: translateY(-50%);
    -o-transform: translateY(-50%);
    transform: translateY(-50%);
}

.box-shadow {
    background-color: #AC92EC;
    width: 160px;
    height: 90px;
    margin-top: -45px;
    margin-left: -80px;
    position: absolute;
    top: 50%;
    left: 50%;
}
.box-shadow:after {
    content: "";
    width: 150px;
    height: 1px;
    margin-top: 88px;
    margin-left: -75px;
    display: block;
    position: absolute;
    left: 50%;
    z-index: -1;
    -webkit-box-shadow: 0px 0px 8px 2px #000000;
       -moz-box-shadow: 0px 0px 8px 2px #000000;
            box-shadow: 0px 0px 8px 2px #000000;
}

button {
    padding: 15px;
    background-image: linear-gradient(#FC6E51, #FFF);
    background-size: auto 200%;
    background-position: 0 100%;
    transition: background-position 0.5s;
}    
button:hover {
    background-position: 0 0;
}

div
{
    -moz-column-count:3; /* Firefox */
    -webkit-column-count:3; /* Safari and Chrome */
    column-count:3;
}

td {
    white-space: nowrap;
}

p:first-child::first-letter{
  font-family: "papyrus";
  font-size: 28px;
  font-weight: bold;
}

/***** Selector Hacks ******/

/* IE6 and below */
* html #uno  { color: red }

/* IE7 */
*:first-child+html #dos { color: red } 

/* IE7, FF, Saf, Opera  */
html>body #tres { color: red }

/* IE8, FF, Saf, Opera (Everything but IE 6,7) */
html>/**/body #cuatro { color: red }

/* Opera 9.27 and below, safari 2 */
html:first-child #cinco { color: red }

/* Safari 2-3 */
html[xmlns*=""] body:last-child #seis { color: red }

/* safari 3+, chrome 1+, opera9+, ff 3.5+ */
body:nth-of-type(1) #siete { color: red }

/* safari 3+, chrome 1+, opera9+, ff 3.5+ */
body:first-of-type #ocho {  color: red }

/* saf3+, chrome1+ */
@media screen and (-webkit-min-device-pixel-ratio:0) {
 #diez  { color: red  }
}

/* iPhone / mobile webkit */
@media screen and (max-device-width: 480px) {
 #veintiseis { color: red  }
}


/* Safari 2 - 3.1 */
html[xmlns*=""]:root #trece  { color: red  }

/* Safari 2 - 3.1, Opera 9.25 */
*|html[xmlns*=""] #catorce { color: red  }

/* Everything but IE6-8 */
:root *> #quince { color: red  }

/* IE7 */
*+html #dieciocho {  color: red }

/* Firefox only. 1+ */
#veinticuatro,  x:-moz-any-link  { color: red }

/* Firefox 3.0+ */
#veinticinco,  x:-moz-any-link, x:default  { color: red  }



/***** Attribute Hacks ******/

/* IE6 */
#once { _color: blue }

/* IE6, IE7 */
#doce { *color: blue; /* or #color: blue */ }

/* Everything but IE6 */
#diecisiete { color/**/: blue }

/* IE6, IE7, IE8 */
#diecinueve { color: blue\9; }

/* IE7, IE8 */
#veinte { color/*\**/: blue\9; }

/* IE6, IE7 -- acts as an !important */
#veintesiete { color: blue !ie; } /* string after ! can be anything */

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

<figure class='logo'>
    <span></span>
    <img class='photo'/>
</figure>
.logo {
  display: block;
  text-align: center;
  display: block;
  text-align: center;
  vertical-align: middle;
  border: 4px solid #dddddd;
  padding: 4px;
  height: 74px;
  width: 74px; }
  .logo * {
    display: inline-block;
    height: 100%;
    vertical-align: middle; }
    .logo .photo {
    height: auto;
    width: auto;
    max-width: 100%;
    max-height: 100%; }

// HTML
<input id="mycheck1" type="checkbox" />
<label for="mycheck1">Check box label here</label>
<br />
<input id="mycheck2" type="checkbox" checked/>
<label for="mycheck2">Check box label here</label>
<br />
<input id="mycheck3" type="checkbox" />
<label for="mycheck3">Check box label here</label>

// CSS
input:checked + label{
    background: yellow;  
}

selector {
    filter: alpha(opacity=50); /* internet explorer */
    -khtml-opacity: 0.5;      /* khtml, old safari */
    -moz-opacity: 0.5;       /* mozilla, netscape */
    opacity: 0.5;           /* fx, safari, opera */
}

// 外投影
.shadow {
  -moz-box-shadow: 5px 5px 5px #ccc;
  -webkit-box-shadow: 5px 5px 5px #ccc;
  box-shadow: 5px 5px 5px #ccc;
}

// 内投影
.shadow {
   -moz-box-shadow:inset 0 0 10px #000000;
   -webkit-box-shadow:inset 0 0 10px #000000;
   box-shadow:inset 0 0 10px #000000;
}

#div {
   min-height: 500px;
   height:auto !important;
   height: 500px;
}

#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');
}

/* slightly enhanced, universal clearfix hack */
.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 */

a[href], input[type='submit'], input[type='image'], label[for], select, button, .pointer {
       cursor: pointer;
}

<!-- css -->
@media only screen and (max-device-width: 1024px) and (orientation:portrait) { 
    .landscape { display: none; }
}
@media only screen and (max-device-width: 1024px) and (orientation:landscape) { 
    .portrait { display: none; }
}

<!-- example markup -->
<h1 class="portrait">Your device orientation is "portrait"<h1>
<h1 class="landscape">Your device orientation is "landscape"<h1>

pre{
height: 120px;
overflow: auto;
font-family: “Consolas”,monospace;
font-size: 9pt;
text-align:left;
background-color: #FCF7EC;
overflow-x: auto; /* Use horizontal scroller if needed; for Firefox 2, not
white-space: pre-wrap; /* css-3 */
white-space: -moz-pre-wrap !important; /* Mozilla, since 1999 */
word-wrap: break-word; /* Internet Explorer 5.5+ */
margin: 0px 0px 0px 0px;
padding:5px 5px 3px 5px;
white-space : normal; /* crucial for IE 6, maybe 7? */
}

/* 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 */
}

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,
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-weight: inherit;
    font-style: inherit;
    font-size: 100%;
    font-family: inherit;
    vertical-align: baseline;
}
/* remember to define focus styles! */
:focus {
    outline: 0;
}
body {
    line-height: 1;
    color: black;
    background: white;
}
ol, ul {
    list-style: none;
}
/* tables still need 'cellspacing="0"' in the markup */
table {
    border-collapse: separate;
    border-spacing: 0;
}
caption, th, td {
    text-align: left;
    font-weight: normal;
}
blockquote:before, blockquote:after,
q:before, q:after {
    content: "";
}
blockquote, q {
    quotes: "" "";
}

#borders {
   position:relative;
   z-index:1;
   padding:30px;
   border:5px solid #f00;
   background:#ff9600;
}
#borders:before {
   content:"";
   position:absolute;
   z-index:-1;
   top:5px;
   left:5px;
   right:5px;
   bottom:5px;
   border:5px solid #ffea00;
   background:#4aa929;
}

#borders:after {
   content:"";
   position:absolute;
   z-index:-1;
   top:15px;
   left:15px;
   right:15px;
   bottom:15px;
   border:5px solid #00b4ff;
   background:#fff;
}

textarea { overflow: auto; }

blockquote {
    background:#f9f9f9;
    border-left:10px solid #ccc;
    margin:1.5em 10px;
    padding:.5em 10px;
    quotes:"\201C""\201D""\2018""\2019";
}
blockquote:before {
    color:#ccc;
    content:open-quote;
    font-size:4em;
    line-height:.1em;
    margin-right:.25em;
    vertical-align:-.4em;
}
blockquote p {
    display:inline;
}

<!doctype html>
<html>
<head>
  <title>Placeholder demo</title>
  <style type="text/css">
    input:-moz-placeholder {
      color: green;
    }
  </style>
</head>
<body>
  <input id="test" placeholder="Placeholder text!">
</body>
</html>

* { margin:0; padding:0; } 

html, body, #wrap { height: 100%; }

body > #wrap {height: auto; min-height: 100%;}

#main { padding-bottom: 150px; }  /* must be same height as the footer */

#footer {
        position: relative;
        margin-top: -150px; /* negative value of footer height */
        height: 150px;
        clear:both;} 

/* CLEAR FIX*/
.clearfix:after {content: ".";
        display: block;
        height: 0;
        clear: both;
        visibility: hidden;}
.clearfix {display: inline-block;}
/* Hides from IE-mac \*/
* html .clearfix { height: 1%;}
.clearfix {display: block;}
/* End hide from IE-mac */
<div id="wrap">

        <div id="main" class="clearfix">

        </div>

</div>

<div id="footer">

</div>

.rgba {
  background-color: transparent;
  background-color: rgba(200,200,200,0.8);
  filter:progid:DXImageTransform.Microsoft.gradient(startColorstr=#99dddddd,endColorstr=#99dddddd);
  -ms-filter: "progid:DXImageTransform.Microsoft.gradient(startColorstr=#99dddddd,endColorstr=#99dddddd)";
}

.content {
    margin: 0 auto 8px;
    display: table;
    }

.content div {
    display: table-cell;
    }

<!--[if IE]>
.content {
    display: block;
    text-align: center;
    }
.content div {
    display: inline;
    zoom: 1;
}
<![endif]-->

/* external links */
a[href^="http://"]
{
padding-right: 13px;
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: 18px;
background: url(acrobat.png) no-repeat center right;
}

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 */

::selection
{
color: white;
background-color: red;
}

::-moz-selection  /* Firefox needs an extra attention for this */
{
color: white;
background-color: red;
} 

p:first-letter{
        display:block;
        margin:5px 0 0 5px;
        float:left;
        color:#FF3366;
        font-size:60px;
        font-family:Georgia;
    }