.node circle {
    cursor: pointer;
    stroke: #3182bd;
    stroke-width: 1.5px;
}

.node text {
    font: 10px sans-serif;
    pointer-events: none;
    text-anchor: middle;
}

line.link {
    fill: none;
    stroke: #9ecae1;
    stroke-width: 1.5px;
}