css

常见css技巧

Posted by WWJ on June 15, 2018

CSS常用技巧

背景图高斯模糊且全屏显示

enter image description here

  • css3高斯滤镜filter:blur(Pixels) ```vbscript-html
```scss
.normal{
    width: 400px;
    height: 300px;
    background: url(https://image.ibb.co/mTuQAd/deploy_success.png);
    background-size: 100% 100%;
    display: inline-block;
    margin: 100px 30px;
}
.blur {
    filter: blur(3px)
}

背景图片模糊，文字不模糊

enter image description here

<div class="blur">
    <div class="wrap"></div>
    <div class="text">文字不模糊</div>
</div>

.blur{
    position: relative;
    width: 400px;
    height: 300px;
    border: 1px solid #ccc;
}
.wrap {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url(https://image.ibb.co/mTuQAd/deploy_success.png);
    background-size: 100% 100%;
    filter: blur(3px);
}
.text {
    position: absolute;
    color: brown;
    font-size: 36px;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    z-index: 10;
}

垂直水平居中

  • 绝对定位 + 已知宽高 
    .box {
  position:absulote;
  top:50%;
  left:50%;
  margin-left:-(box容器宽度的一半);
  margin-top:-(box容器高度的一半);
}
  • 绝对定位 + 未知宽高 
    .box {
  position:absulote;
  top:50%;
  left:50%;
  transform: translate(-50%, -50%);
}
  • Flex布局 
    .box{
  display:flex;
  align-items: center;
  justify-content: center;
}

loading…效果

enter image description here

<div class="loading"></div>

.loading{
    width: 400px;
    height: 300px;
    position: relative;
    border: 1px solid #ccc;
}
.loading::before{
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 30px;
    height: 30px;
    border-top: 3px solid #c53333;
    border-bottom: 3px solid #96da81;
    border-left: 3px solid #5d8fa7;
    border-right: 3px solid #9b5981;
    border-radius: 50%;
    animation: spin 2s linear infinite;
}
@keyframes spin {
    0% {
        transform: rotate(0deg);
    }
    100% {transform: rotate(360deg)}
}

tip提示(三角形)

enter image description here

<div class="tip top"></div>
<div class="tip bottom"></div>
<div class="tip left"></div>
<div class="tip right"></div>


.tip{
   width: 200px;
   height: 100px;
   border-radius: 4px;
   background-color: #383838;
   position: relative;
   display: inline-block;
   margin-top: 100px;
   margin-left: 30px;
}
.tip::before{
    content: '';
    position: absolute;
    height: 0;
    width: 0;
    border: 20px solid transparent;
}
.top::before{
    top: 0%;
    left: 50%;
    transform: translate(-50%, -100%);
    border-bottom: 20px solid #383838;
}
.bottom::before{
    top: 100%;
    left: 50%;
    transform: translate(-50%, 0%);
    border-top: 20px solid #383838;
}
.left::before{
    top: 50%;
    left: 0;
    transform: translate(-100%, -50%);
    border-right:20px solid #383838; 
}
.right::before{
    top: 50%;
    left: 100%;
    transform: translate(0%, -50%);
    border-left:20px solid #383838; 
}

样式重置

html,body,div,h1,h2,h3,h4,h5,h5,ul,ol,li,p,span,strong,em,i,img,dl,dt,dd,table,tr,th,td,
address,abbr,circle,cite,code,embed,iframe,input,image,label,menu,nav,object,pre,select,
tbody,textarea,tfoot,thead,title,video{
    padding: 0;
    margin: 0;
    border: 0;
    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; 
}

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

ol, ul { list-style: 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; }
a {text-decoration: none}

display:block | none切换时的动画

<body>
  <div class="header">
    <span class="line"></span>
    <ul class="list-wrap">
      <li class="list-item">全部作品</li>
      <li class="list-item">全新体验</li>
      <li class="list-item">最新动态</li>
    </ul>
    <span class="line"></span>
  </div>
  <div class="body">
    <div class="list-item active">1</div>
    <div class="list-item">2</div>
    <div class="list-item">3</div>
  </div>
</body>

.header {
 display: flex;
  justify-content: center;
  align-items: center;
}
.header .line {
  display: block;
  width: 390px;
  height: 1px;
  background-color: #ddd;
}
.header .list-wrap {
  margin: 0 35px;
  display: flex;
}
.header .list-item {
  cursor: pointer;
  font-size: 18px;
  color: #333;
  position: relative;
}
.header .list-item:not(:last-child) {
  padding-right: 30px;
}
.header .list-item::before {
  position: absolute;
  content: "";
  width: 4px;
  height: 4px;
  background: #ddd;
  border-radius: 50%;
  left: 84%;
  top: 38%;
}
.body{
  margin-top: 30px;
}
.body .list-item {
  display: none;
  width: 600px;
  height: 400px;
  background: #ddd;
  border-radius: 10px;
  margin: auto;
  color: #fff;
  font-size: 100px;
  text-align: center;
  line-height: 400px
}
.body .active{
  display: block;
  animation: activeIdx 0.3s ease-in;
}
@keyframes activeInx{
  0%{opacity: 0.5;}
  100%{opacity: 1;}
}

css - 导航条hover样式由中间向两边扩散

<body>
    <div class="nav">
        <div class="list-wrap">
            <li class="list-item">首页</li>
            <li class="list-item">博客</li>
            <li class="list-item">团队介绍</li>
            <li class="list-item">项目介绍</li>
            <li class="list-item">体验试用</li>
            <li class="list-item">合作联系</li>
        </div>
    </div>
</body>

.nav{
  height: 140px;
    background-color: #070707;
    margin: 200px auto;
}
.list-wrap{
    display: flex;
    justify-content: center;
    height: 100%;
    align-items: center;
}
.list-item{
    list-style: none;
    color:#fff;
    cursor: pointer;
    position: relative;
    margin-right: 100px
}
.list-item::after, .list-item::before{
    position: absolute;
    content: '';
    top: 125%;
    left: 56%;
    width: 0%;
    height: 3px;
    background-color: #3e82f7;
    transition: all .2s ease-in;
}
.list-item:hover::after {
    width: 60%;
    left: 50%;
}
.list-item:hover::before{
    width: 60%;
    left: -10%
}
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