前端常用得CSS代码分享

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1，垂直居中对齐

.vc {
   position: absolute;
   top: 50%;
   left: 50%;
   transform: translate(-50%, -50%);
}
.vc {
   position:absolute;
   top: 50%;
   left: 50%;
   width: 100px;
   height: 100px;
   margin:-50px 0 -50px;
}

2，全屏显示

html,
body {
    position: fixed;
    width: 100%;
    height: 100%;
}
div {
    height: 100%;
}

3，不同的标签链接使用不同的样式

// link

a[href^="http://"]{
    background: url(link.gif) no-repeat center right;
}
// emails
a[href^="mailto:"]{
    background: url(email.png) no-repeat center right;
}

// pdfs

a[href$=".pdf"]{
    background: url(pdf.png) no-repeat center right;
}

4，图像灰度

img {
    filter: gray;
    -webkit-filter: grayscale(1);
}

5，背景渐变动画

bg {
    background-image: linear-gradient(#5187c4, #1c2f45);
    background-size: auto 200%;
    background-position: 0 100%;
    transition: background-position 0.5s;
}
bg:hover {
    background-position: 0 0;
}

6，长文本自动换行

pre {
    white-space: pre-line;
    word-wrap: break-word;
}

7，模糊文本

.text {
   filter: blur(1px);
}

8，用CSS动画实现省略号动画

.point:after {
    overflow: hidden;
    display: inline-block;
    vertical-align: bottom;
    animation: ellipsis 2s infinite;
    content: "\2026";
}
@keyframes ellipsis {
    from {
        width: 2px;
    }
    to {
        width: 15px;
    }
}

9，样式重置

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, 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, article, aside, canvas, details, embed, figure, figcaption, footer, header, hgroup, menu, nav, output, ruby, section, summary, time, mark, audio, video {
  margin: 0;
  padding: 0;
  border: 0;
  font-size: 100%;
  font: inherit;
  vertical-align: baseline;
  outline: none;
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  box-sizing: border-box;
}
html { height: 101%; }
body { font-size: 62.5%; line-height: 1; font-family: Arial, Tahoma, sans-serif; }
article, aside, details, figcaption, figure, footer, header, hgroup, menu, nav, section { display: block; }
ol, ul { list-style: none; }
blockquote, q { quotes: none; }
blockquote:before, blockquote:after, q:before, q:after { content: ''; content: none; }
strong { font-weight: bold; }
table { border-collapse: collapse; border-spacing: 0; }
img { border: 0; max-width: 100%; }
p { font-size: 1.2em; line-height: 1.0em; color: #333; }

10，清除浮动

.clearfix:before, .container:after { content: ""; display: table; }
.clearfix:after { clear: both; }
.clearfix { zoom: 1; }

11，css元素透明

.transparent {
    filter: alpha(opacity=50);
    -khtml-opacity: 0.5;
    -moz-opacity: 0.5;
    opacity: 0.5;
}

12，CSS引用样式

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;
}

13，个性圆角

.borderRadius {
    border-radius: 4px 3px 6px 10px;
}
.borderRadius {
    border-top-left-radius: 4px;
    border-top-right-radius: 3px;
    border-bottom-right-radius: 6px;
    border-bottom-left-radius: 10px;
}

14，通用媒体查询

@media only screen and (min-device-width : 320px) and (max-device-width : 480px) {
  /* Styles */
}
@media only screen and (min-width : 321px) {
  /* Styles */
}
@media only screen and (max-width : 320px) {
  /* Styles */
}
/* iPad */
@media only screen and (min-device-width : 768px) and (max-device-width : 1024px) {
  /* Styles */
}
@media only screen and (min-device-width : 768px) and (max-device-width : 1024px) and (orientation : landscape) {
  /* Styles */
}

@media only screen and (min-device-width : 768px) and (max-device-width : 1024px) and (orientation : portrait) {
  /* Styles */
}
/* 桌面 */
@media only screen and (min-width : 1224px) {
  /* Styles */
}

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

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

15，自定义文本选择

::selection { background: #e2eae2; }

16，图片边框偏光

img.polaroid {
    background:#000;
    border:solid #fff;
    border-width:6px 6px 20px 6px;
    box-shadow:1px 1px 5px #333;
    -webkit-box-shadow:1px 1px 5px #333;
    -moz-box-shadow:1px 1px 5px #333;
    height:200px;
    width:200px;
}

17，锚链接伪类

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

18，全屏背景图

html {
    background: url('bg.jpg') no-repeat center center fixed;
    background-size: cover;
}

19，内容垂直居中

.center {
    min-height: 6.5em;
    display: table-cell;
    vertical-align: middle;
}

20，强制出现垂直滚动条

html { height: 101% }