.HYJK{
    color:#507267;
    font-family: sans-serif;
    font-size: 40px;
    text-align: center;
}
/*.studio{*/
/*    font-size:30px;*/
/*}*/
/*.studio a{*/
/*    margin-left:580px;*/
/*    color:#507267;*/
/*    font-family: sans-serif;*/
/*    text-align: left;*/
/*    font-weight: bold;*/
/*}*/

.centered {
    margin: 0 auto;
    position: absolute;
    top:40%;
    left: 20%;
    /*display:inline-block;*/
}
div a {
    /*alignment-adjust: center;*/
    font-family: sans-serif;
    background-color:black;
    text-decoration: none;
    color: white;
    font-size: 20px;
    padding: 15px;
    display:inline-block;
}
.interaction{
    font-size:40px;
}
.studio{
    font-size:30px;
}
.lab{
    font-size:30px;
}

ul {
  display: inline;
  padding: 0;
}
ul li {display: inline-block;}
ul li:hover {background: #555;}
ul li:hover ul {display: block;}
ul li ul {
  position: absolute;
  width: 200px;
  display: none;
}
ul li ul li { 
  background: #507267;; 
  display: block; 
}
ul li ul li a {display:block !important;} 
ul li ul li:hover {background: #666;}