monaco-editor/test/manual/index.css

.monaco-editor .token.custom-info {
	color: grey !important;
}
.monaco-editor .token.custom-error {
	color: red !important;
	font-weight: bold !important;
	font-size: 1.2em !important;
}
.monaco-editor .token.custom-notice {
	color: orange !important;
}
.monaco-editor .token.custom-date {
	color: green !important;
}