.left-con {
    width: 240px;
    padding: 70px 0;
    float: left;
    border-radius: 20px;

}
.right-con {
    width: calc(100% - 240px);
    padding: 50px 0 50px 52px;
    float: left;
    background: #ffffff;
    border-radius: 20px;
}

.breadcrumbs {
    width: 100%;
}

.nev_left {
    font-size: 16px;
}
.nev_left li {
    height: 60px;
    padding-left: 70px;
    line-height: 60px;
}
.nev_left img {
    margin-right: 20px;
}
.nev_left a {
    display: block;
    color: inherit;
}

.nev_left li:hover,
.nev_left li.active {
    background: #ffaf02;
    position: relative;
}
.nev_left li:hover img,
.nev_left li.active img {
    mix-blend-mode: difference;
}
.nev_left li:hover:after,
.nev_left li.active:after {
    content: '';
    position: absolute;
    right: 0;
    top: 0;
    width: 5px;
    height: 100%;
    background: #000;
}
.c-yellow {
    color: #ffaf02;
}

.about-bg {
    background-image: linear-gradient(90deg, #ededed 50%, #ffffff 50%);
}
.bg-gray {
    background: #ededed;
}

.bottom {
    padding: 20px 0;
}
.bottom .tit {
    font-size: 28px;
    text-align: center;
}


.bottom-nav {
    margin-bottom: 50px;
    /*background: url("../../images/newImg/course.png");*/
    width: 100%;
    /*background-size: cover;*/
    height: 39px;
    border-bottom: 1px solid #ddd;
    overflow: hidden;
    font-size: 18px;
    font-weight: bold;
    border-left: 1px solid #ddd;
    border-top-left-radius: 10px;
    overflow: hidden;
}
.bottom-nav .bottom-nav-item {
    background: url("../../images/newImg/course_none.png");
    width: 200px;
    height: 38px;
    float: left;
    text-align: center;
    padding-right: 30px;
    line-height: 38px;
    margin-left: -46px;
}
.bottom-nav .bottom-nav-item:first-child {
    margin-left: 0;
}
.bottom-nav .bottom-nav-item.active {
    background: url("../../images/newImg/course_cur.png");
}
.kc-icons {
    overflow: hidden;
    margin-bottom: 50px;
}
.kc-icons .kc-icon {
    text-align: center;
    float: left;
    width: 25%;
}
.kc-icons .kc-icon .icon {
    text-align: center;
}