course-server/public/vendor/inspinia/css/pages/manage.css

#manage .manage-box {
    background: #ffffff;
}

#manage .manage-box .tab-content {
    padding: 25px;
}

#manage .manage-box .tab-content .message-list {
    border-top: 1px solid #dddddd;
    margin-top: 20px;
    padding: 20px 0;
}