#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;
}
/*----------------------FOOTER-------------------------*/

.footer a:hover {
    color: #83bcff!important;
}
.div-50 {
    width: 100%;
    float: left;
    height: 50px;
}
.uppercase {
    text-transform: uppercase;
}
.txt-head {
    font-family: "Noto Serif", serif;
    font-weight: 400;
}
.txt-head.medium {
    font-size: 20px;
}
.mt-20 {
    margin-top: 20px;
}
.social-icons.colored a {
    color: #fff;
}
.social-icons.blue a {
    background-color: #0077d4;
}
.drop-accordion .tab-collapsed {
    border: transparent;
    background: transparent;
    -webkit-transition: .5s;
    -o-transition: .5s;
    transition: .5s;
}
.drop-accordion .panel-default {
    width: 100%;
    float: left;
    border: 0;
    border-radius: 0;
    -webkit-box-shadow: none;
    box-shadow: none;
}
.bg-1c5599 {
    background-color: #1c5599;
}
.drop-accordion .panel-heading {
    margin-bottom: 5px;
    padding: 0;
    background: transparent;
    border-radius: 0;
}
.mt-10 {
    margin-top: 10px;
}
.panel-title.right a {
    padding: 10px 50px 10px 0;
}
.panel-title a {
    display: block;
    position: relative;
    color: #6f6f6f;
}
.panel-title.right .expand-icon-wrap {
    right: 0;
    top: 8px;
    color: #fff;
}
.panel-title .expand-icon-wrap {
    position: absolute;
    top: 0;
    bottom: 0;
    font-size: 12px;
    line-height: 30px;
    color: #7a7a7a;
}
.panel-title.right .mdi {
    width: 25px;
    height: 25px;
    line-height: 25px;
    border: 1px solid #0077d4;
    background-color: #0077d4;
    display: block;
    font-size: 15px;
}
.panel-title .mdi.mdi-minus {
    display: none;
}
.tab-collapsed .mdi.mdi-minus {
    display: block;
}
.tab-collapsed .mdi.mdi-plus {
    display: none;
}
.panel-title .mdi {
    border-radius: 50%;
    vertical-align: middle;
    text-align: center;
}
.tab-collapsed .right .expand-icon-wrap {
    color: #fff;
}
.drop-accordion .panel-body {
    position: relative;
    padding: 10px 0;
    border-top: 0 !important;
}
.social-icons a {
    margin: 0 15px 6px 0;
    display: inline-block;
    width: 40px;
    height: 40px;
    color: #fff;
    background-color: #0077d4;
    line-height: 40px;
    text-align: center;
    font-size: 23px;
    -webkit-transition: all 0.3s ease-in-out;
    -moz-transition: all 0.3s ease-in-out;
    -ms-transition: all 0.3s ease-in-out;
    -o-transition: all 0.3s ease-in-out;
    transition: all 0.3s ease-in-out;
    -webkit-border-radius: 3px;
    border-radius: 3px;
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
}
.social-icons a:last-child {
    margin-right: 0;
}
.social-icons:not(.colored) a:hover {
    background-color: #83bcff !important;
    color: #fff !important;
}
.social-icons.dark a {
    background-color: #23252a;
    color: #fff;
}
.social-icons.blue a {
    background-color: #0077d4;
    color: #fff;
}
.social-icons.large a {
    width: 50px;
    height: 50px;
    line-height: 50px;
    font-size: 16px;
}
.social-icons.transparent a {
    background-color: transparent;
    color: #fff;
}
.rounded a {
    -webkit-border-radius: 50%;
    border-radius: 50%;
}
.square a {
    -webkit-border-radius: 0%;
    border-radius: 0%;
}
.social-icons.colored a {
    color: #fff;
}
.social-icons.colored a:hover {
    opacity: 0.9;
}
.colored .social-twitter {
    background-color: #00acee;
}
.colored .social-facebook {
    background-color: #3b5998;
}
.colored .social-google-plus {
    background-color: #dd4b39;
}
.colored .social-linkedin {
    background-color: #0e76a8;
}
.colored .social-vimeo {
    background-color: #1ab7ea;
}
.colored .social-youtube {
    background-color: #c4302b;
}
.colored .social-instagram {
    background-color: #3f729b;
}
.colored .social-pinterest {
    background-color: #c8232c;
}
.colored .social-rss {
    background-color: #f26522;
}
.colored .social-dribbble {
    background-color: #ea4c89;
}
.colored .social-skype {
    background-color: #00aff0;
}
.colored .social-soundcloud {
    background-color: #ff3300;
}
.colored .social-vk {
    background-color: #45668e;
}
.colored .social-delicious {
    background-color: #3399ff;
}
.colored .social-android {
    background-color: #a4c639;
}
.colored .social-digg {
    background-color: #000000;
}
.colored .social-reddit {
    background-color: #ff4500;
}
.colored .social-dropbox {
    background-color: #007ee5;
}
.colored .social-odnoklassniki {
    background-color: #ed812b;
}
.colored .social-github {
    background-color: #4183c4;
}
.colored .social-flickr {
    background-color: #ff0084;
}
.colored .social-lastfm {
    background-color: #d51007;
}
.colored .social-email {
    background-color: #242424;
}
.social-twitter:hover {
    background-color: #fff !important;
    color: #00acee !important;
}
.social-facebook:hover {
    background-color: #fff !important;
    color: #3b5998 !important;
}
.social-google-plus:hover {
    background-color: #fff !important;
    color: #dd4b39 !important;
}
.social-youtube:hover {
    background-color: #fff !important;
    color: #c4302b !important;
}
.footer {
    color: #fff;
    background: #1c5599;
    font-size: 15px;
}
.footer a {
    color: #fff;
    text-decoration: none;
}
.footer a:hover {
    color: #83bcff;
}
/* -----------------------------------
  * FOOTER
  * 1000 > x >691; 690>x>510; 509 
-------------------------------------- */

.footer .drop-accordion .panel-heading {
    margin-bottom: 0;
}
.footer .drop-accordion .panel-body {
    padding: 0;
}
@media (max-width: 1000px) {
    .footer .div-50 {
        height: 10px;
    }
}
@media (max-width: 1000px) and (min-width: 691px) {
    .footer .address {
        width: 65%;
        float: left;
    }
    .footer .social-icons {
        width: 35%;
        float: left;
    }
    .footer .social-icons.mt-20 {
        margin-top: 0;
    }
}
@media (max-width: 1000px) and (min-width: 870px) {
    .footer .f-item {
        float: left;
    }
    .footer .f-item:nth-of-type(1) {
        width: 100%;
    }
    .footer .f-item:nth-of-type(2) {
        width: 42%;
    }
    .footer .f-item:nth-of-type(3) {
        width: 20%;
    }
    .footer .f-item:nth-of-type(4) {
        width: 38%;
    }
}
@media (max-width: 869px) and (min-width: 691px) {
    .footer .f-item {
        float: left;
    }
    .footer .f-item:nth-of-type(1) {
        width: 100%;
    }
    .footer .f-item:nth-of-type(2) {
        width: 35%;
    }
    .footer .f-item:nth-of-type(3) {
        width: 25%;
    }
    .footer .f-item:nth-of-type(4) {
        width: 40%;
    }
}
@media (max-width: 690px) and (min-width: 510px) {
    .footer .f-item {
        float: left;
    }
    .footer .f-item:nth-of-type(1) {
        width: 60% !important;
    }
    .footer .f-item:nth-of-type(2) {
        width: 40%;
    }
    .footer .f-item:nth-of-type(3) {
        width: 40%;
        float: right;
        clear: both;
    }
    .footer .f-item:nth-of-type(3) .mt-10 {
        margin-top: 20px;
    }
    .footer .f-item:nth-of-type(4) {
        width: 60%;
    }
}
@media (max-width: 509px) {
    .footer .f-item {
        float: left;
        width: 100%;
    }
}
/*end footer*/
/* -- CONTAINER -- */
/* >1200 */
@media (min-width: 1200px) {
  .container {
    width: 1200px; } }
/* <=1199 */
@media (max-width: 1199px) {
  .container {
    width: 100%; } }
@media (max-width: 919px) {
  .affix {
    position: relative; } }

.content-write *{
	    font-family: "Roboto", Arial, Helvetica, sans-serif!important;
font-size: 16px!important;
}
/*=======Video Youtube=======*/
.main-video iframe {
    width: 100%;
    height: 600px;
    text-align: center;
    margin-top: 10px;
}

.color-namevideo {
    color: #0f5398;
    font-weight: bold;
}

.list-video iframe {
    width: 100%;
    min-height: 300px;
}

.list-video .col-sm-6.col-lg-4:nth-child(3n+1) {
    clear: both;
}
/*============En==============*/