.minor-grid {
    stroke: #eee;
    stroke-width: 0.5;
}
.major-grid {
    stroke: #ddd;
    stroke-width: 1;
}
.bold-grid {
    stroke: #aaa;
    stroke-width: 1.5;
}
.time-label {
    font-size: 10px;
    fill: #666;
}
#chart-container {
    overflow-x: auto;
}