.link { 
    fill: none;
    stroke: #666;
    stroke-width: 1.5px;
}
circle {
    fill: #ccc;
    stroke: #333;
    stroke-width: 1.5px;
}
text {
    text-baseline:middle;
    text-anchor:middle;
    font: 10px sans-serif;
    /*pointer-events: none;*/
    text-shadow: 0 1px 0 #fff, 1px 0 0 #fff, 0 -1px 0 #fff, -1px 0 0 #fff;
}