.history{
    position: relative;
}
.history:before{
    position: absolute;
    z-index: 0;
    content: "";
    width: 1px;
    height: 100%;
    background: #e1e1e1;
    top: 0;
    left: 50%;
    bottom: 0;
}
.history li{
    float: left;
    position: relative;
    width: 540px;
    margin-bottom: 45px;
    padding: 10px;
    box-shadow: 2px 1px 7px rgba(0,0,0,.2);
    background: #fff;
	font-family:"Microsoft YaHei";
}
.history .pic{
    width: 283px;
}
.history .text{
    width: 227px;
    padding:0 10px;
}
.history .text .date{
    line-height: 30px;
    font-size: 18px;
    font-weight: bold;
    color: #007ac5;
}
.history .text .title{
    line-height: 22px;
    margin-bottom: 15px;
    padding-bottom: 15px;
    font-size: 16px;
    color: #007ac5;
    border-bottom: 1px solid #e1e1e1;
}
.history .text .descri{
    line-height: 24px;
    font-size: 14px;
    color: #333;
}
.history li .arrow{
    position: absolute;
    top: 25px;
    width: 24px;
    background: #fff;
}
.history li .arrow i{
    position:absolute;
    z-index: -1;
    width:23px;
    height:23px;
    overflow:hidden;
    pointer-events:none;
    -webkit-transform:rotate(45deg);
    -mz-transform:rotate(45deg);
    transform:rotate(45deg);
    background: #fff;
    box-shadow: 2px 0 7px rgba(0,0,0,.3);
}

.history li .arrow-mask{
    position: absolute;
    top: 20px;
    width:0;
    height:0;
    font-size:0;
    line-height:0;
}
.history li:nth-child(2n) .arrow-mask{
    left: -16px;
    border-bottom:17px solid transparent;
    border-top:17px solid transparent;
    border-right:17px solid #fff;
}
.history li:nth-child(2n+1) .arrow-mask{
    right: -16px;
    border-bottom:17px solid transparent;
    border-top:17px solid transparent;
    border-left:17px solid #fff;
}
.history li .circle{
    position: absolute;
    top: 30px;
    z-index: 2;
    content: "";
    width: 8px;
    height: 8px;
    border: 3px solid #97c618;
    background: #fff;
    border-radius: 999px;
}
.history li:nth-child(2n) .circle{
    left: -47px;
}
.history li:nth-child(2n+1) .circle{
    right: -47px;
}
.history li:first-child+li{
    margin-top: 135px;
}