#main-menu .hover-sub:hover{
    background: #155899!important;
}
#main-menu .hover-sub a:hover {
    color: #fff!important;
    font-size: 15px;
    font-weight: 400;
    line-height: 10px;
    text-transform: uppercase;
    font-family: 'Noto Serif', serif;
}
.hidden{
    display: none;
}

/*=============== backtotop====================*/
.backtotop {
  /*background-color: #2689EF;*/
  background: rgb(28, 85, 153);
  width: 40px;
  height: 40px;
  bottom: 15px;
  z-index: 999;
  right: 12px;
  padding: 5px 0;
  border: 1px solid;
  overflow: hidden;
  position: fixed;
  display: block;
  text-align: center;
  -webkit-border-radius: 30px;
  -moz-border-radius: 30px;
  border-radius: 30px;
  color: #fff; 

}

.backtotop i {
  font-size: 27px;
  margin: 0;
  padding-right: 0;
  display: block; }

.backtotop:hover {
  color: #fff; }

#thong-bao ul>div>li>a, .de-cuong-bai-giang ul>li>a, .tong-khoa ul>div>li>a {
    color: #6f6f6f;
    font-size: 16px;
    font-weight: 300;
    line-height: 24px;
}

 .img-height{
    height: auto!important;
}


.content-write *{
	    font-family: "Roboto", Arial, Helvetica, sans-serif!important;
font-size: 16px!important;
}