return [[

/* styles for prettification of source */
pre .comment { color: #558817; }
pre .constant { color: #a8660d; }
pre .escape { color: #844631; }
pre .keyword { color: #aa5050; font-weight: bold; }
pre .library { color: #0e7c6b; }
pre .marker { color: #512b1e; background: #fedc56; font-weight: bold; }
pre .string { color: #8080ff; }
pre .number { color: #f8660d; }
pre .operator { color: #2239a8; font-weight: bold; }
pre .preprocessor, pre .prepro { color: #a33243; }
pre .global { color: #800080; }
pre .user-keyword { color: #800080; }
pre .prompt { color: #558817; }
pre .url { color: #272fc2; text-decoration: underline; }

]]