#menu3d ul#ul3d {
    list-style-type: none;
    margin: 0 auto;
    padding: 0;
    overflow: hidden;
    background-color: white;
	display: flex;
	justify-content: center;
}

#menu3d ul#ul3d li {
    float: left;
	height: 40px;
}

#menu3d ul#ul3d li a, .dropbtn {
    display: inline-block;
    color: blue;
    text-align: center;
    padding: 5px 5px;
    text-decoration: none;
	font-weight: bold;
}

#menu3d ul#ul3d li:hover, #menu3d ul#ul3d li a:hover, .dropdown:hover .dropbtn {
	text-decoration: none;
	color: black;
}

#menu3d ul#ul3d li .dropdown{
    display: inline-block;
}

.dropdown-content {
    display: none;
    position: absolute;
    background-color: #f9f9f9;
    min-width: 160px;
    box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
	top: 0px;
	}

.dropdown-content a {
    color: black;
    padding: 12px 16px;
    text-decoration: none;
    display: block;
    text-align: left;
}

.dropdown-content a:hover {
	background-color: #f1f1f1
}

.dropdown:hover .dropdown-content {
    display: block;
}

.div3d
{
position: relative; 
top: -38px; 
} 

.iframe3d {
position: fixed; top: 10px; left: 300px; width: 59%; height: 95%; border: 3px solid black; visibility: hidden; background: white; z-index: 1999999;
}