path.arc {
    cursor: move;
    fill: #fff;
}

.node {
    font-size: 10px;
}

    .node:hover {
        fill: #1f77b4;
    }

.link {
    fill: none;
    stroke: #1f77b4;
    stroke-opacity: .4;
    pointer-events: none;
}

    .link.source, .link.target {
        stroke-opacity: 1;
        stroke-width: 2px;
    }

.node.target {
    fill: #d62728 !important;
}

.link.source {
    stroke: #d62728;
}

.node.source {
    fill: #2ca02c;
}

.link.target {
    stroke: #2ca02c;
}