#title {
    font-size: 2em;
    text-align: center;
}

.node rect {
    cursor: move;
    fill-opacity: 0.7;
    shape-rendering: crispEdges;
}

.node text {
    pointer-events: none;
    text-shadow: 0 1px 0 #fff;
}

.link {
    fill: none;
    stroke: #000;
    stroke-opacity: 0.2;
}

.link:hover {
    stroke-opacity: 0.5;
}