.info-bg{
    background: url(/img/us/kecheng.png) center center no-repeat;
    height: 1200px;
    text-align: center;
}
.info .title{
    padding-top: 50px;
    box-sizing: border-box;
    height: 180px;
}
.info h1{
    margin: 0 auto;
    text-align: center;
    line-height: 100px;
    letter-spacing: 15px;
    width: 300px;
    border-bottom: 5px double #000;
}

.course h1{
    text-align: center;
}
.course{
    margin: 0 auto;
    background: #f9f9f9;
}
.course img{
    width: 394px;
    height: 296px;
}
.course-box{
    display: flex;
    justify-content: space-between;
}
.left-1-item{
    width: 788px;
    display: flex;
    justify-content: space-between;
}
.left-1-item div{
    height: 296px;
    width: 396px;
    margin-bottom: 18px;
}
.course-info{
    padding: 30px;
    box-sizing: border-box;
    background: #fff;
}
.course p{
    font-size: 20px;
    color: #666;
}
.right-1{
    width: 394px;
}

.bg{
    height:328px ;
    color: #fff;
    background: url(/img/us/title.png) no-repeat;
    margin-bottom: -100px;
    text-align: center;
}
.bg h1{
    padding-top: 50px;
    margin: 0 auto;
    text-align: center;
    line-height: 100px;

    letter-spacing: 15px;
    width: 190px;
    border-bottom: 5px double #fff;
}

.bg1{
    height:200px ;
    width:100%;
    background: url(/img/us/title.png) no-repeat;
    text-align: center;
    background-position: 0 -128px;
}
.bg1 h1{
    padding-top: 30px;
    margin: 0 auto;
    text-align: center;
    line-height: 100px;
    color: #fff;
    letter-spacing: 15px;
    width: 190px;
    border-bottom: 5px double #fff;
}
.tutorial-items,.reason-items{
    justify-content: space-between;
    padding-top: 70px;
    padding-bottom: 70px;
}

.tutorial-item{
    width: 250px;
    height: 275px;
    background: #eee;
}
.bg2 h1{
    width: 426px;
}
.reason-items{
    flex-wrap: wrap;
}

.reason-item{
    width: 376px;
    height: 210px;
    background: #eee;
    margin-bottom: 40px;
    border-radius: 15px;
    padding: 20px 30px ;
    box-sizing: border-box;
}

.reason .title{
    font-size: 28px;
}
.reason .desc{
    font-size: 17px;
}