В extra.less нужного стиля вставляем код:
Less:
.bbCodeCode {
background: #272822;
color: #ccc;
padding: 15px;
margin: -5px -10px;
.prism-token {
&.prism-comment,
&.prism-prolog,
&.prism-doctype,
&.prism-cdata {
color: slategray;
}
&.prism-punctuation {
color: #f8f8f2;
}
.namespace {
opacity: .7;
}
&.prism-property,
&.prism-tag,
&.prism-constant,
&.prism-symbol,
&.prism-deleted {
color: #f92672;
}
&.prism-boolean,
&.prism-number {
color: #ae81ff;
}
&.prism-selector,
&.prism-attr-name,
&.prism-string,
&.prism-char,
&.prism-builtin,
&.prism-inserted {
color: #a6e22e;
}
&.prism-operator,
&.prism-entity,
&.prism-url,
.language-css &.prism-string,
.style &.prism-string,
&.prism-variable {
color: #f8f8f2;
}
&.prism-atrule,
&.prism-attr-value,
&.prism-function {
color: #e6db74;
}
&.prism-keyword {
color: #66d9ef;
}
&.prism-regex,
&.prism-important {
color: #fd971f;
}
&.prism-important,
&.prism-bold {
font-weight: bold;
}
&.prism-italic {
font-style: italic;
}
&.prism-entity {
cursor: help;
}
}
}