body {
    font-family: Courier, sans-serif;
    background-color: #292929;
    color: #ffffff;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    height: 100vh;
}

#graph-container {
    width: 600px;
    height: 400px;
}

circle {
    cursor: pointer;
}

circle:hover {
    stroke: #ff7f00;
    stroke-width: 2;
}

line {
    stroke: #999;
    stroke-opacity: 0.6;
}

line:hover {
    stroke: #ff7f00;
}