diff --git a/src/@core/scss/template/_default-layout-w-vertical-nav.scss b/src/@core/scss/template/_default-layout-w-vertical-nav.scss
index 3ad6ed5a..92ba9ed9 100644
--- a/src/@core/scss/template/_default-layout-w-vertical-nav.scss
+++ b/src/@core/scss/template/_default-layout-w-vertical-nav.scss
@@ -28,10 +28,9 @@ $header: ".layout-navbar";
 
     // Scrolled styles for sticky navbar
     @at-root {
-      /* ℹ️ This html selector with not selector is required when:
-        dialog is opened and window don't have any scroll. This removes window-scrolled class from layout and out style broke
+      /* ℹ️ Only apply scrolled styles when window is actually scrolled,
+        not when dialog is opened without scroll
     */
-      html.v-overlay-scroll-blocked .layout-navbar-fixed,
       &.window-scrolled.layout-navbar-fixed {
 
         #{$header} {
@@ -43,6 +42,21 @@ $header: ".layout-navbar";
           @extend %blurry-bg;
         }
       }
+
+      /* ℹ️ Ensure header styles are preserved when dialog is opened,
+        regardless of scroll state
+    */
+      html.v-overlay-scroll-blocked &.window-scrolled.layout-navbar-fixed {
+
+        #{$header} {
+          @extend %default-layout-vertical-nav-scrolled-sticky-elevated-nav;
+          @extend %default-layout-vertical-nav-floating-navbar-and-sticky-elevated-navbar-scrolled;
+        }
+
+        .navbar-blur#{$header} {
+          @extend %blurry-bg;
+        }
+      }
     }
   }
 
diff --git a/src/@core/scss/template/placeholders/_misc.scss b/src/@core/scss/template/placeholders/_misc.scss
index 7851f401..56116a3d 100644
--- a/src/@core/scss/template/placeholders/_misc.scss
+++ b/src/@core/scss/template/placeholders/_misc.scss
@@ -1,6 +1,5 @@
 %blurry-bg {
     position: relative;
-    background: rgba(var(--v-theme-background), 1);
     box-shadow: 0 1px 3px rgba(0, 0, 0, 4%), 0 1px 2px rgba(0, 0, 0, 2%);
 
     @media (width > 768px) {
diff --git a/src/styles/custom.scss b/src/styles/custom.scss
index f294d4b5..bd3ebaba 100644
--- a/src/styles/custom.scss
+++ b/src/styles/custom.scss
@@ -6,21 +6,15 @@
 
 html.v-overlay-scroll-blocked {
   position: fixed;
+  position: relative;
+
+  --v-body-scroll-y: 0px !important;
 }
 
-/* 防止Chrome移动端下拉刷新干扰 */
 body {
   overscroll-behavior: none;
 }
 
-@media (width <= 768px){
-  html.v-overlay-scroll-blocked {
-    position: relative;
-
-    --v-body-scroll-y: 0px !important;
-  }
-}
-
 @mixin hide-scrollbar {
   -ms-overflow-style: none;
   scrollbar-width: none;