#course_content{
    padding-top: 50px;
    padding-bottom: 50px;
    background-color: white;
}

#course_content .section{
    margin-top: 20px;
}
#course_content .title-section{
    background: #e8e8e8;
    color: black;
    padding: 10px 16px!important;
    font-size: 16px;
    border-bottom: 1px solid #fff !important;
    font-weight: bold;
    cursor: pointer;
}
#course_content .lecture {
    overflow-y: auto;
    background: #f0f0f0;
    line-height: 2;
    padding: 10px 16px;
    font-size: 16px;
    border-bottom: 1px solid #fff;
    display: block;
    text-decoration: none!important;
    font-weight: lighter;
    color: #000000db;
}

#course_content .title-lecture{
    white-space: nowrap;
    overflow-x: hidden;
    text-overflow: ellipsis;
    width: calc(100% - 150px);
    float: left;
}
#course_content .btn-preview{
    color: white;
    font-weight: bold;
}
#course_content a:hover{
    color: #000!important;
}