.videoWrapper{	position:relative;	padding-bottom:56.25%; /* 16:9 */	padding-top:25px;	height:0}
.videoWrapper iframe{	position:absolute;	top:0;	left:0;	width:100%;	height:100%}
.vluyenthi li.hl-list-nonstyle {
    padding: 18px;
    border: 1px solid #ccc;
    border-bottom: none;
}ul.vluyenthi {
    padding: 0;
    border-bottom: 1px solid #ccc;
}.vluyenthi li.hl-list-nonstyle:hover {
    background: #dedfe0;
}.entry-content {
    text-align: justify;
    padding: 20px 10px;
}
.entry-content h2 {font-size: 24px;}
.entry-content h3 {font-size: 23px;}
.entry-content h4 {font-size: 22px;}
.bb table, .bb tr, .bb td {
    border: 1px solid;
}
.overheight {
    max-height: 530px;
    overflow-y: scroll;
}.col-md-6.mdv1 {
    padding-right: 0;
}.col-md-6.mdv2 {
    padding-left: 10px;
}.entry-content2.overheight2 iframe.active,.content.active {
    visibility: hidden;
}.batdau {
    margin: 50px;
    text-align: center;
}.classroom.classroombb.classroombbactive.hackvideo {
    display: none;
}div.card-main {
    padding: 10px 8px !important;
    border: 1px solid rgb(121 181 253 / 13%);
    font-weight: bold;
    color: #fff;
    background: #3873b7;
}tbody, td, tfoot, th, thead, tr {
    border-width: 1px !important;
    padding: 4px !important;
}