Module:Edit history/styles.css

.edit-history-plusminus-pos {
	color: #006400;
}

.edit-history-plusminus-neg {
	color: #8b0000;
}

.edit-history-plusminus-null {
	color: #a2a9b1;
}

.edit-history-autocomment {
	color: #72777d;
}