#referenceOverlay.overlay {
    height: 600px;
	overflow:hidden;
    width: 0;
    position: fixed;
    z-index: 99999;
    top: 0;
    left: 0;
    background-color: #f1f1f1;
    background-color: #f1f1f1;
    overflow-x: hidden;
    transition: 0.5s;
}



#referenceOverlay.overlay a {
    padding: 8px;
    text-decoration: none;
    font-size: 36px;
    color: #818181;
    display: block;
    transition: 0.3s;
}

#referenceOverlay.overlay a:hover, #referenceOverlay.overlay a:focus {
    color: #f1f1f1;
}
#referenceOverlay.overlay .closebtn {
    position: absolute;
    top: 20px;
    right: 45px;
    font-size: 60px;
}

@media screen and (max-height: 450px) {
#referenceOverlay.overlay a {font-size: 20px}
#referenceOverlay.overlay .closebtn {
    font-size: 40px;
    top: 0px;
    right: 35px;
    color:#818181;
  }
}
#referenceOverlay.overlay .closebtn::after {
color:#818181;
}
#referenceOverlay.overlay .closebtn:hover {
color:#818181;
}