.pc_header.white .nav li:nth-child(3)>a {
    color: black
}

.pc_header.white .nav li:nth-child(5)>a {
    color: #ff5a00
}

.h-btn-div .btn-back-div {
    color: black;
    font-size: 26px;
    font-weight: bold
}

.bg_1 .ul-div {
    width: 785px
}

.class-con {
    margin-bottom: 100px
}

.m-btn-div .m-btn {
    width: 145px;
    background-color: white;
    color: black;
    font-size: 30px
}

.m-btn-div .m-btn .btn-img-div {
    display: none
}

.m-btn-div .m-btn.active .btn-img-div {
    display: block;
    margin-left: 5px
}

.m-btn-div .m-btn.active {
    color: #ff5a00
}

.bg-4-c-m {
    text-align: left;
}

.class-con .bg-4m-t1 {
    font-size: 20px;
    color: #626262;
    font-weight: bold;
    margin-bottom: 5px;
    margin-top: 20px;
    margin-left: 35px
}

.class-con .bg-4m-t2,
.class-con .bg-4m-t3 {
    margin-bottom: 10px;
    font-size: 14px;
    color: #676767;
    margin-top: 5px;
    line-height: 25px;
    display: -webkit-box;
    -webkit-box-orient: vertical;
    -webkit-line-clamp: 2;
    overflow: hidden;
}

.class-con .bg-4m-t2 {
    height: 45px;
    padding: 0px 35px
}

.class-con .bg-4m-t3 {
    text-align: right;
    margin-right: 30px;
    margin-top: 0px
}

.bg_1 .ul-div ul li>a {
    width: 175px
}

.bg_1 .footer-nav ul li>a {
    color: #ffffff
}

@media (max-width: 750px) {
    .m-btn-div {
        width: 85%
    }
    .m-btn-div .m-btn {
        font-size: 32px;
        width: 155px;
    }
    .class-con .bg-4m-t1 {
        margin: 10px auto 10px;
    }
    .class-con {
        margin-bottom: 0px
    }
    .class-con .bg-4-c {
        flex-direction: row;
        flex-wrap: wrap;
        justify-content: space-between;
    }
    .class-con .bg-4-c .bg-4-c-m {
        width: 373px
    }
    .class-con .bg-4m-img {
        height: 205px;
        background-color: #333333
    }
    .class-con .bg-4-c-m {
        height: 370px;
        margin: 0px;
        overflow: hidden
    }
    .class-con .bg-4m-t1 {
        font-size: 24px;
        height: 35px;
        overflow: hidden;
        color: #a5a5a5;
        line-height: 35px;
        padding: 0px 5px
    }
    .class-con .bg-4m-t2 {
        font-size: 20px;
        height: 60px;
        overflow: hidden;
        text-overflow: ellipsis;
        -webkit-line-clamp: 2;
        display: -webkit-box;
        -webkit-box-orient: vertical;
        text-align: left;
        color: #a5a5a5;
        margin: 0 0 10px 0px;
        padding: 0px 5px;
        line-height: 30px;
        letter-spacing: 1px;
    }
    .class-con .bg-4m-t3 {
        font-size: 20px;
        height: 48px;
        overflow: hidden;
    }
    .class-con .bg-4m-t3 {
        margin-top: 0px;
    }
    .nvaheader {
        width: 100%;
        display: flex;
        justify-content: space-between;
        align-items: center;
    }
    .nvaheader .tells {
        display: flex;
        align-items: center;
    }
    .navclick {
        width: 100%;
        position: fixed;
        bottom: -2%;
        z-index: 2000;
        display: none;
    }
    .navclick ul>li {
        list-style: none;
        height: 52px;
        padding-top: 2%;
        border-bottom: 1px solid#b3b3b3;
    }
    .navclick ul {
        display: flex;
        flex-direction: column;
        text-align: center;
        font-size: 20px;
        padding: 0px;
        background-color: #858585;
    }
    .navclick ul>li a {
        color: #fff;
    }
}