.online {
    background-color: #ecf0f1;
}
.online h4 {
    display: inline-block;
    line-height: 30px;
}

.nav1 {
    height: 50px;
    margin: 0px auto;
    margin-top: 25px;
    background-color: rgb(235, 235, 235);
}

.nav-tabs1>li>a {
    margin-right: 2px;
    line-height: 50px;
    text-align: center;
    width: 100px;
    height: 50px;
    float: left;
    text-decoration: none;
    /* /* border: 1px solid red; */
}

.nav-tabs1>li.active>a,
 .nav-tabs1>li.active>a:focus, 
 .nav-tabs1>li.active>a:hover {
    color: #555;
    cursor: default;
    background-color: #fff;
    border-top: 1px solid #ecf0f1;
    border-bottom-color: transparent;
    width: 100px;
    line-height: 50px;
    height: 50px;
    border-left: #ecf0f1 1px solid;
    float: left;
}

.online-all {
    border: 1px solid #ecf0f1;
    margin:0 auto;
    padding-top: 20px;
    border-top: 0px;
}

.online-right {
    padding: 9px;
    margin-left: 10px;
    border-radius: 3px;
    display: block;
    width: 100px;
    text-align: center;
}

.online-right a:hover{
    color:#fff;
}

.online-top {
    border-bottom: 1px solid #eee;
    padding: 20px;
    padding-top: 0px;
}

.online-top>span {
    margin: 20px;
    line-height: 36px;
}

.online-top>span:hover {
    color: rgb(209, 172, 172);
}

.online-content {
    margin: 20px 0;
    display: flex;
    flex-wrap: wrap;
    white-space: normal;
    padding-left: 5px;
}

.content1 {
    width: 269px;
    margin: 8px;
    padding-bottom: 10px;
    float: left;
}

.course_img{
    width: 269px;
    height: 140px;
    overflow: hidden;
}

.course_list:hover {
    box-shadow: 1px 1px 1px 1px rgb(226, 226, 226);
    -webkit-transform: translateY(-5px);
    -moz-transform: translateY(-5px);
    -ms-transform: translateY(-5px);
    transform: translateY(-5px);
}

.course_list .img {
    width: 100%;
}

.img1 {
    width: 20px;
    height: 20px;
    margin: 2px 5px;
}

.course_list p {
    color: rgb(119, 118, 118);
    margin-top: 10px;
    padding: 0 5px;
    overflow: hidden;
}
.course_list span {
    color: rgb(163, 163, 163);
    /* margin: -1px; */
    padding: 5px;
}