diff --git a/frontend/src/components/pc/Layout.jsx b/frontend/src/components/pc/Layout.jsx
index 5b87b34..0834c51 100644
--- a/frontend/src/components/pc/Layout.jsx
+++ b/frontend/src/components/pc/Layout.jsx
@@ -230,9 +230,10 @@ export default function Layout() {
         style={{ color: 'var(--text-strong)' }}
       >
         <header
-          className="sticky top-0 z-20 border-b backdrop-blur-md shrink-0"
+          className="sticky top-0 z-20 border-b shrink-0"
           style={{
             borderColor: 'var(--header-border)',
+            background: 'var(--bg-from)',
           }}
         >
           <div className="mx-auto flex max-w-[1400px] items-center justify-between px-6 py-4">
diff --git a/frontend/src/index.css b/frontend/src/index.css
index de69ef1..5265779 100644
--- a/frontend/src/index.css
+++ b/frontend/src/index.css
@@ -319,9 +319,6 @@ html, body, #root {
   background-color: var(--bg-from);
   background-image: linear-gradient(to bottom right, var(--bg-from), var(--bg-via), var(--bg-to));
   background-attachment: fixed;
-  transition:
-    background-color 500ms cubic-bezier(0.4, 0, 0.2, 1),
-    background-image 500ms cubic-bezier(0.4, 0, 0.2, 1);
 }
 html {
   overscroll-behavior-y: contain;