body {
    font-family: Arial, sans-serif;
    background-color: #f4f4f4;
}

text {
    font-family: Arial, sans-serif;
}

.box-group rect {
    stroke-width: 2px;
    stroke: #333;
    fill-opacity: 0.8;
    cursor: pointer;
    transition: all 0.3s ease;
}

.box-group rect:hover {
    fill-opacity: 1;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

.box-group text {
    pointer-events: none;
}

h1 {
    text-align: center;
    font-size: 24px;
    color: #333;
    padding: 20px 0;
    background-color: #f0f0f0;
    border-bottom: 2px solid #ccc;
}