body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
}

header {
    background: #333;
    color: #fff;
    padding: 1rem;
    text-align: center;
}

#family-tree-container {
    width: 100%;
    height: 100vh;
    overflow: auto;
}

.node circle {
    fill: #fff;
    stroke: steelblue;
    stroke-width: 3px;
}

.node text {
    font: 12px sans-serif;
}

.link {
    fill: none;
    stroke: #ccc;
    stroke-width: 2px;
}