/* Element selector */
body {
    font-family: Arial, sans-serif;
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
    line-height: 1.6;
}

/* Class selector */
.image-container {
    text-align: center;
    margin: 20px 0;
    padding: 10px;
    border: 2px solid #ddd;
    border-radius: 8px;
    background-color: #f9f9f9;
}

/* ID selector */
#tree-diagram {
    max-width: 100%;
    height: auto;
    border-radius: 4px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}