div {
    box-sizing: border-box;
}


.elevator {
    position: sticky;
    top: 310px;    
    width: 200px;
    height: 300px;
    margin-left: 600px;
    z-index: 3;
    background-color: rgb(189, 189, 189);
    
}

.tunnel {
    position: absolute;
    margin-left: 600px;
    width: 200px;
    height: 3886px;
    z-index: 2;
    background-color:rgb(73, 73, 73)
    
}

#groundfloor {
    background-color: rgb(189, 189, 189);
    z-index: 1;
    height: 300px;
    width: 100%;
    display: block;
    
}

.building {
    background-color:rgb(46, 46, 46);
    margin: auto;
    width: 1400px;
    height: auto;
    
}

.right-floor {
    background-color: rgb(189, 189, 189);
    z-index: 1;
    float: right;
    height: 300px;
    width: 600px;
    display: block;
}

.left-floor {
    background-color: rgb(189, 189, 189);
    z-index: 1;
    float: left;
    height: 300px;
    width: 600px;
    display: block;
}

.right-floor p, .left-floor p {
    text-align: center;
}

.space {
    display: block;
    clear: both;
    opacity: 0;
}