ui-log: color line changes

Signed-off-by: Christian Hesse <mail@eworm.de>
diff --git a/ui-log.c b/ui-log.c
index d6d94f6..c97b8e0 100644
--- a/ui-log.c
+++ b/ui-log.c
@@ -258,7 +258,8 @@
 	if (ctx.repo->enable_log_filecount)
 		htmlf("</td><td>%d", files);
 	if (ctx.repo->enable_log_linecount)
-		htmlf("</td><td>-%d/+%d", rem_lines, add_lines);
+		htmlf("</td><td><span class='deletions'>-%d</span>/"
+			"<span class='insertions'>+%d</span>", rem_lines, add_lines);
 
 	html("</td></tr>\n");