这是一款创意多彩CSS3垂直时间轴特效。该CSS3垂直时间轴通过CSS伪元素和css transform属性，制作椭圆形和箭头，并配以多彩的颜色，构建出漂亮的垂直时间轴效果。
使用方法
在页面中引入bootstrap.min.css文件。
<link rel="stylesheet" href="bootstrap.min.css" type="text/css">
HTML结构
该CSS3垂直时间轴的基本HTML结构如下：
<div class="container">
<div class="row">
<div class="col-md-12">
<div class="main-timeline">
<div class="timeline">
<a href="#" class="timeline-content">
<span class="year">2018</span>
<div class="inner-content">
<h3 class="title">Web Designer</h3>
<p class="description">
Lorem ipsum dolor sit amet...
</p>
</div>
</a>
</div>
<div class="timeline">
<a href="#" class="timeline-content">
<span class="year">2017</span>
<div class="inner-content">
<h3 class="title">Web Developer</h3>
<p class="description">
Lorem ipsum dolor sit amet...
</p>
</div>
</a>
</div>
</div>
</div>
</div>
</div>
CSS样式
然后为该CSS3垂直时间轴添加下面的CSS样式，对其进行效果的美化。
.main-timeline{
overflow: hidden;
position: relative;
}
.main-timeline:before{
content: "";
width: 7px;
height: 100%;
background: #909090;
position: absolute;
top: 0;
left: 50%;
transform: translateX(-50%);
}
.main-timeline .timeline{
width: 50%;
padding-left: 50px;
float: right;
position: relative;
}
.main-timeline .timeline:before{
content: "";
width: 30px;
height: 30px;
border-radius: 50%;
background: #909090;
border: 7px solid #fff;
position: absolute;
top: 50%;
left: -15px;
transform: translateY(-50%);
}
.main-timeline .timeline:after{
content: "";
display: block;
border-right: 30px solid #ee4423;
border-top: 20px solid transparent;
border-bottom: 20px solid transparent;
position: absolute;
top: 50%;
left: 24px;
transform: translateY(-50%);
}
.main-timeline .timeline-content{
display: block;
padding: 25px;
border-radius: 100px;
background: #ee4423;
position: relative;
}
.main-timeline .timeline-content:before,
.main-timeline .timeline-content:after{
content: "";
display: block;
width: 100%;
clear: both;
}
.main-timeline .timeline-content:hover{ text-decoration: none; }
.main-timeline .inner-content{
width: 70%;
float: right;
padding: 15px 20px 15px 15px;
background: #fff;
border-radius: 0 100px 100px 0;
color: #ee4423;
}
.main-timeline .year{
display: inline-block;
font-size: 50px;
font-weight: 600;
color: #fff;
position: absolute;
top: 50%;
left: 7%;
transform: translateY(-50%);
}
.main-timeline .title{
font-size: 24px;
font-weight: 600;
text-transform: uppercase;
margin: 0 0 5px 0;
}
.main-timeline .description{
font-size: 14px;
margin: 0 0 5px 0;
}
.main-timeline .timeline:nth-child(2n){ padding: 0 50px 0 0; }
.main-timeline .timeline:nth-child(2n):before,
.main-timeline .timeline:nth-child(2n) .year{
left: auto;
right: -15px;
}
.main-timeline .timeline:nth-child(2n) .year{ right: 7%; }
.main-timeline .timeline:nth-child(2n):after{
border-right: none;
border-left: 30px solid #ee4423;
left: auto;
right: 24px;
}
.main-timeline .timeline:nth-child(2n) .inner-content{
float: none;
border-radius: 100px 0 0 100px;
text-align: right;
}
.main-timeline .timeline:nth-child(2){ margin-top: 130px; }
.main-timeline .timeline:nth-child(odd){ margin: -130px 0 0 0; }
.main-timeline .timeline:nth-child(even){ margin-bottom: 80px; }
.main-timeline .timeline:first-child,
.main-timeline .timeline:last-child:nth-child(even){ margin: 0; }
.main-timeline .timeline:nth-child(2n) .timeline-content{ background: #f68829; }
.main-timeline .timeline:nth-child(2n),
.main-timeline .timeline:nth-child(2n) .inner-content{ color: #f68829; }
.main-timeline .timeline:nth-child(2n):after{ border-left-color: #f68829; }
.main-timeline .timeline:nth-child(3n) .timeline-content{ background: #2991d0; }
.main-timeline .timeline:nth-child(3n),
.main-timeline .timeline:nth-child(3n) .inner-content{ color: #2991d0; }
.main-timeline .timeline:nth-child(3n):after{ border-right-color: #2991d0; }
.main-timeline .timeline:nth-child(4n) .timeline-content{ background: #9361aa; }
.main-timeline .timeline:nth-child(4n),
.main-timeline .timeline:nth-child(4n) .inner-content{ color: #9361aa; }
.main-timeline .timeline:nth-child(4n):after{ border-left-color: #9361aa; }
.main-timeline .timeline:nth-child(5n) .timeline-content{ background: #a7be26; }
.main-timeline .timeline:nth-child(5n),
.main-timeline .timeline:nth-child(5n) .inner-content{ color: #a7be26; }
.main-timeline .timeline:nth-child(5n):after{ border-right-color: #a7be26; }
@media only screen and (max-width: 1200px){
.main-timeline .inner-content{ width: 80%; }
.main-timeline .year{
font-size: 45px;
left: 10px;
transform: translateY(-50%) rotate(-90deg);
}
.main-timeline .timeline:nth-child(2n) .year{ right: 10px; }
}
@media only screen and (max-width: 990px){
.main-timeline .year{
font-size: 40px;
left: 0;
}
.main-timeline .timeline:nth-child(2n) .year{ right: 0; }
}
@media only screen and (max-width: 767px){
.main-timeline:before,
.main-timeline .timeline:before{
left: 10px;
transform: translateX(0);
}
.main-timeline .timeline:nth-child(2n):after{
border-left: none;
border-right: 30px solid #ee4423;
right: auto;
left: 24px;
}
.main-timeline .timeline,
.main-timeline .timeline:nth-child(even),
.main-timeline .timeline:nth-child(odd){
width: 100%;
float: none;
margin: 0 0 30px 0;
}
.main-timeline .timeline:last-child{ margin-bottom: 0; }
.main-timeline .timeline:nth-child(2n){ padding: 0 0 0 50px; }
.main-timeline .timeline:before,
.main-timeline .timeline:nth-child(2n):before{ left: -2px; }
.main-timeline .inner-content{ width: 85%; }
.main-timeline .timeline:nth-child(2n) .inner-content{
float: right;
border-radius: 0 100px 100px 0;
text-align: left;
}
.main-timeline .timeline:nth-child(2n) .year{
right: auto;
left: 0;
}
.main-timeline .timeline:nth-child(2n):after{ border-right-color: #f68829; }
.main-timeline .timeline:nth-child(3n):after{ border-left-color: #2991d0; }
.main-timeline .timeline:nth-child(4n):after{ border-right-color: #9361aa; }
.main-timeline .timeline:nth-child(5n):after{ border-left-color: #a7be26; }
}
@media only screen and (max-width: 479px){
.main-timeline .timeline-content{ padding: 15px; }
.main-timeline .inner-content{ width: 80%; }
.main-timeline .year{ font-size: 30px; }
}
