body {
    background: white;
    color: black;
}
pre {
    background: #f0f0f0;
    white-space: pre;
    width: 100%;
    border-style: none;
    border-width: thin;
    font-family: monospace;
}
code {
    background: #f0f0f0;
}
h2 {
    color: orange;
}
h3 {
    color: green;
}
h4 {
    color: red;
}