.header{
    
}
.nav-box{
    max-width: 1140px;
    width: 100%;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    height: 96px;
    padding: 0 20px;
    box-sizing: border-box;
}
.nav-box .logo{
    width: 80px;
    margin-right: auto;
}
.nav-item{
    font-size: 24px;
    line-height: 61px;
    color: #000000;
    margin-left: 100px;
}
.nav1{
}

.main{
    position: relative;
    background: url(https://activity-1254383113.file.myqcloud.com/qianyixuetang/main-bg.jpg) repeat-y;
    background-size: 100% 900px;
}

.index1 img{
    display: block;
    width: 100%;
}
.index2{
    width: 80%;
    max-width: 960px;
    margin: 0 auto;
}
.index2 img{
    display: block;
    width: 100%;
}
.index3 img{
    display: block;
    width: 100%;
}
.fotter{
    height: 250px;
    max-width: 1140px;
    width: 100%;
    display: flex;
    margin: 0 auto;
    align-items: center;
    justify-content: center;
    background: white;
    flex-wrap: wrap;
    margin-top: 20px;
}
.fotter .logo{
    width: 160px;
}
.fotter .msg{
    padding-left: 40px;
}
.fotter .link{
    font-size: 16px;
    line-height: 40px;
}
.fotter .dsc{
    font-size: 16px;
    line-height: 40px;
    display: flex;
    flex-wrap: wrap;

}
.fotter .beian{
    font-size: 16px;
    line-height: 40px;

}



/* about */
.header-about{
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 9;
    background: rgba(255, 255, 255, 0.4);
}
.header-about .nav-item{
    color: rgba(255, 255, 255, 0.6);
    transition: all 0.5s;
}
.header-about .active{
    color: white;
}
.header-about .nav-item:hover{
    color: white;
}
.about-1{
    position: relative;
}
.about-1 .title{
   width: 100%;
   position: absolute;
   bottom: -6%;
   display: flex;
   justify-content: center;
}
.about-1 .title img{
    width: 80%;
    display: block;
    max-width: 800px;
}
.about-4{
    background: url(https://activity-1254383113.file.myqcloud.com/qianyixuetang/about-4-bg.png) no-repeat;
    background-size: 100% 100%;
    padding: 50px 0;
}
.about-4 img{
    max-width: 750px;
    width: 80%;
    display: block;
    margin: 0 auto;
}

@media (max-width: 640px) {
    .nav-item{
        font-size: 16px;
        line-height: 61px;
        color: #000000;
        margin-left: 20px;
    }
    .nav-box .logo{
        width: 58px;
    }
    .fotter .logo{
        width: 80px;
    }
    .fotter .link{
        font-size: 14px;

    }
    .fotter .dsc{
        font-size: 14px;

    }
    .fotter .beian{
        font-size: 14px;
        
    }
}