body {
    font-family: Arial, sans-serif;
    margin: 20px;
    text-align: center;
    background-color: #02449c;
}

#graph-container {
    width: 1000px;
    height: 1000px;
    margin: 0 auto;
    /*border: 1px solid #ccc;*/
    background-color: #02449c;
}

.node circle {
    fill: #000;
    stroke: #fff;
    stroke-width: 10px;
    cursor: pointer;
}

.node image {
    cursor: pointer;
}

.node text {
    font-size: 30px;
    fill: #29d0e3;
    text-anchor: middle;
    pointer-events: none;
}

.link {
    stroke: #999;
    stroke-opacity: 0.6;
    stroke-width: 2px;
}

.node:hover circle {
    fill: #555;
}

.node:hover text {
    font-weight: bold;
}