html, body {
    width: 100%;
    height: 100%; /* Keep height 100% for the initial render area */
    padding: 0;
    margin: 0;
    /* Removed overflow: hidden; to allow page scrolling */
    font-family: Helvetica;
}
#tree {
    width: 80%; /* Changed width from 100% to 80% */
    height: 100%;
}