diff --git a/cmd/d2/static/watch.css b/cmd/d2/static/watch.css
index 8c5bccc9a..3e389ddbb 100644
--- a/cmd/d2/static/watch.css
+++ b/cmd/d2/static/watch.css
@@ -1,4 +1,4 @@
-#d2c-err {
+#d2-err {
   /* This style was copied from Chrome's svg parser error style. */
   white-space: pre-wrap;
   border: 2px solid #c77;