.pre {

    padding-top: 50px;

    /* margin-bottom: 170px; */

    font-size: 0;
    position: relative;
    background: #eeeeee;
}



.centerSelf {

    position: relative;

    width: 1200px;

    margin: 0 auto;

}

.carousel{
    /* height: 715px; */
}

.pre .centerSelf > div {

    display: inline-block;

    vertical-align: text-top;

}



.img {

    /*overflow: hidden;*/

    margin-right: 92px;

}



.img > img {

    /* width: 560px;

    height: 420px; */

    transition: all 1s;

}



.img > img:hover {

    transform: scale(1.1)

}



.preRight {

    position: relative;

}

/* body{
    background: #eeeeee!important;
} */

.grayWordIndex{

    top: 0;

    z-index: -1;

    position: absolute;

    font-weight: bold;

    /*font-family: "Microsoft Yahei";*/

    font-size: 60px;

    line-height: 60px;

    color: #f0f0f0;

}



.preName {

    margin-top: 32px;

    /*font-family: "PingFang-SC-Bold";*/

    font-weight: bold;

    color: #333;

    font-size: 36px;

    line-height: 36px;

}



.borderShort {

    display: inline-block;

    width: 56px;

    border-bottom: 3px solid #999;

    margin-top: 36px;

    margin-bottom: 50px;

}



.preIndro {

    font-size: 18px;

    color: #666;

    /*font-family: "PingFang-SC-Medium";*/

    margin-bottom: 56px;

}



.scienceIndro {
    padding-left: 50px;
    line-height: 30px;
    
    font-size: 18px;

    color: #666;

    display: inline-block;

    width: 640px;



}



.preIndro > li {

    line-height: 30px;

}

.understand {

    padding: 0 30px;

    display: inline-block;

    height: 46px;

    line-height: 46px;

    text-align: center;

    color: #3f7eff;

    background-color: #ebebeb;

    border-radius: 26px;

    font-size: 18px;

}

.understand:hover {

    text-decoration: none;

    transition: all .3s linear;

    background:#3888ff;

    color: #fff;

}



.courseServe {

    background-color: #fafafa;

    margin-top: 125px;

    padding-bottom: 193px;

}



.courseName {

    text-align: center;

    margin-top: 64px;

    position: relative;

}



.severContent {

    margin-top: 83px;

}



.severContent > div {

    position: relative;

    display: inline-block;

    width: 560px;

    height: 285px;

    vertical-align: text-top;

    overflow: hidden;

}

.severContent > div:hover a img{

    /*-webkit-filter: brightness(200%); !* Chrome, Safari, Opera *!*/

    /*filter: brightness(200%);*/

    transform: scale(1.2);

    transition:all linear 0.6s;

}



.severDetails {

    z-index: 2;

    text-align: center;

    position: absolute;

    top: 123px;

    left: 0;

    bottom: 0;

    right: 0;

}

.severName{

    font-size: 22px;

    margin-bottom: 22px;

    color: white;

}

.serverBorder {

    display: inline-block;

    width: 48px;

    border: 3px solid white;

}

.serverImgCircle{
    width: 100px;
    height: 100px;
    background: #fff;
    position: absolute;
    border-radius: 300px;
    z-index: 1;
}

.serverImg{
    margin: 50px;
    position: absolute;
    width: 560px;
    height: 285px;
    z-index: 3;
    vertical-align: text-top;
    overflow: hidden;
}


.serverImg:hover >   a img{

    /*-webkit-filter: brightness(200%); !* Chrome, Safari, Opera *!*/

    /*filter: brightness(200%);*/

    transform: scale(1.2);

    transition:all linear 0.6s;

}

.divBottom{

    margin-bottom: 70px;

}

.preInterval{

    margin-top: 150px;

}

.preInterval >div{

    vertical-align: text-top;

    display: inline-block;

}
.course-serv-bg > div{
    width: 50%;
    height: 500px;
    padding: 0;
    position: relative;
    margin: 0;
    float: left;
}

.course-serv-bg>div:nth-child(1) >.serverImg{
    float: right;
}
.course-serv-bg>div:nth-child(2) >.serverImg{
    float: left;
}