div .wy-side-nav-search .version {
    color: white;
}

#viz-canvas {
    background-color: #000;
    width: 700px;
    height: 700px;
    border: 1px solid black;
    margin: 5px;
    padding: 0px;
    position: static; /* fixed or static */
    top: 5px;
    left: 5px;
}