body {
    font-family: Arial, Helvetica, sans-serif;
    background-color: white;
    color: black;
    padding: 40px;
    margin: 0;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

h1 {
    color: darkblue;
}

h2 {
    color: darkred;
}

p:not(#demo) {
    color: dimgray;
    font-size: 18px;
}

#demo {
    background-color: whitesmoke;
    border-left: 5px solid darkred;
    padding: 15px;
    font-family: "Courier New", Courier, monospace;
    color: darkslategray;
    font-size: 16px;
    white-space: pre-line;
    margin-top: 20px;
    border-radius: 4px;
}