/* Define the style around the 3D Object */
.fullscreen {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
    overflow: auto;
    background: radial-gradient(#EAEAEA, #fff);
}

.modelviewer {
    width: 100%;
    margin: 0 auto;
    height: 100%;
}