diff --git a/webui2/src/components/code/file-viewer.module.css b/webui2/src/components/code/file-viewer.module.css
index 4ab9e8eaf05308eb76116cedbc42ab0068a22a63..b3d5ce0372a6b8fa696c6dcaa60113144aba5f5d 100644
--- a/webui2/src/components/code/file-viewer.module.css
+++ b/webui2/src/components/code/file-viewer.module.css
@@ -37,7 +37,6 @@
   opacity: 0.4;
   user-select: none;
   cursor: pointer;
-  background: transparent !important;
 }
 
 .line-number:hover {
diff --git a/webui2/src/index.css b/webui2/src/index.css
index bad2964cb54d8729db450efbb063d965109ddeeb..0c5e0b2409682689f62f00083afa4115dea14397 100644
--- a/webui2/src/index.css
+++ b/webui2/src/index.css
@@ -112,19 +112,25 @@ body {
 }
 
 /* ── Shiki dual-theme (defaultColor: false) ──────────────────────────────── */
-.shiki,
-.shiki span {
+.shiki {
   color: var(--shiki-light);
   background-color: var(--shiki-light-bg);
+}
+
+.shiki span {
+  color: var(--shiki-light);
   font-style: var(--shiki-light-font-style);
   font-weight: var(--shiki-light-font-weight);
   text-decoration: var(--shiki-light-text-decoration);
 }
 
-.dark .shiki,
-.dark .shiki span {
+.dark .shiki {
   color: var(--shiki-dark);
   background-color: var(--shiki-dark-bg);
+}
+
+.dark .shiki span {
+  color: var(--shiki-dark);
   font-style: var(--shiki-dark-font-style);
   font-weight: var(--shiki-dark-font-weight);
   text-decoration: var(--shiki-dark-text-decoration);