.links line {
    stroke: #999;
    stroke-opacity: 0.6;
    stroke-width: 3; /* Make the link lines thicker for visibility */
}

.nodes circle {
    stroke: #fff;
    stroke-width: 6.5px;
    fill: #6699cc;
}
.nodes{
    top:100px;
    left:100px;
    position: absolute;
}

.nodes text {
    font-size: medium;
    font-family: sans-serif;
}

.tooltip {
    position: absolute;
    text-align: center;
    width: auto;
    min-width: 80px;
    height: auto;
    padding: 4px;
    font: 12px sans-serif;
    background: lightsteelblue;
    border: 1px;
    border-radius: 8px;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.3s;
}