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

.container {
    max-width: 800px;
    margin: 50px auto;
}

#title {
    text-align: center;
}

#description {
    text-align: center;
}

.cell {
    stroke: #fff;
}

.tooltip {
    position: absolute;
    background: rgba(0, 0, 0, 0.8);
    color: white;
    padding: 5px;
    border-radius: 3px;
    pointer-events: none;
}

.legend {
    margin-top: 20px;
}

.legend div {
    display: inline-block;
    margin-right: 10px;
}

.legend div span {
    display: inline-block;
    width: 20px;
    height: 20px;
    margin-right: 5px;
}