html { background-color: #000; }
body { width: 35em; margin: 0 auto;
font-family: Tahoma, Verdana, Arial, sans-serif; }
h1 {color: #FFF;}
pre {
    white-space: pre;
    font-family: "Courier New", monospace;
    margin: 0;
    padding: 0;
    width: 100%;
    overflow: auto;
    max-width: 100%;
    background-color: #000; /* Background color (e.g., black) */
    color: #00FF00; /* Font color (e.g., green) */
}
#color-changing {color: #21cf7a;}