body {
color: black;
background-color: white;
}

.title {
text-align: center
}

.subtitle {
text-align: center;
font-style: italic;
}

.author {
text-align: center;
}

code {
font-size: 120%;
color: green;
}

tt {
font-size: 120%;
}


pre {
color: #009900;
}

.answer {
color: #0000ff;
}

.digit {
color: #ff0000;
}