diff --git a/packages/gitbook/src/components/Header/DropdownMenu.tsx b/packages/gitbook/src/components/Header/DropdownMenu.tsx
index 09c27c3b2..caa506c35 100644
--- a/packages/gitbook/src/components/Header/DropdownMenu.tsx
+++ b/packages/gitbook/src/components/Header/DropdownMenu.tsx
@@ -7,6 +7,7 @@ import { useState } from 'react';
 import { type ClassValue, tcls } from '@/lib/tailwind';
 
 import * as RadixDropdownMenu from '@radix-ui/react-dropdown-menu';
+import { Slot } from '@radix-ui/react-slot';
 
 import { Link, type LinkInsightsProps } from '../primitives';
 
@@ -25,13 +26,21 @@ export function DropdownMenu(props: {
     children: React.ReactNode;
     /** Custom styles */
     className?: ClassValue;
-    /** Open the dropdown on hover */
+    /** Open the dropdown on hover
+     * @default false
+     */
     openOnHover?: boolean;
+    /** Whether to render the dropdown menu in a portal
+     * @default true
+     */
+    withPortal?: boolean;
 }) {
-    const { button, children, className, openOnHover = false } = props;
+    const { button, children, className, openOnHover = false, withPortal = true } = props;
     const [hovered, setHovered] = useState(false);
     const [clicked, setClicked] = useState(false);
 
+    const Portal = withPortal ? RadixDropdownMenu.Portal : Slot;
+
     return (
         <RadixDropdownMenu.Root
             modal={false}
@@ -48,24 +57,27 @@ export function DropdownMenu(props: {
                 {button}
             </RadixDropdownMenu.Trigger>
 
-            <RadixDropdownMenu.Content
-                data-testid="dropdown-menu"
-                hideWhenDetached
-                collisionPadding={8}
-                onMouseEnter={() => setHovered(true)}
-                onMouseLeave={() => setHovered(false)}
-                align="start"
-                className="z-[9999] animate-present pt-2"
-            >
-                <div
-                    className={tcls(
-                        'flex max-h-80 min-w-40 max-w-[40vw] flex-col gap-1 overflow-auto rounded-lg straight-corners:rounded-sm bg-tint-base p-2 shadow-lg ring-1 ring-tint-subtle sm:min-w-52 sm:max-w-80',
-                        className
-                    )}
+            <Portal>
+                <RadixDropdownMenu.Content
+                    data-testid="dropdown-menu"
+                    hideWhenDetached
+                    collisionPadding={8}
+                    onMouseEnter={() => setHovered(true)}
+                    onMouseLeave={() => setHovered(false)}
+                    align="start"
+                    sideOffset={8}
+                    className="z-40 animate-present"
                 >
-                    {children}
-                </div>
-            </RadixDropdownMenu.Content>
+                    <div
+                        className={tcls(
+                            'flex max-h-80 min-w-40 max-w-[40vw] flex-col gap-1 overflow-auto rounded-lg straight-corners:rounded-sm bg-tint-base p-2 shadow-lg ring-1 ring-tint-subtle sm:min-w-52 sm:max-w-80',
+                            className
+                        )}
+                    >
+                        {children}
+                    </div>
+                </RadixDropdownMenu.Content>
+            </Portal>
         </RadixDropdownMenu.Root>
     );
 }
diff --git a/packages/gitbook/src/components/Header/Header.tsx b/packages/gitbook/src/components/Header/Header.tsx
index 74990a82c..6c57909d1 100644
--- a/packages/gitbook/src/components/Header/Header.tsx
+++ b/packages/gitbook/src/components/Header/Header.tsx
@@ -77,7 +77,6 @@ export function Header(props: { context: GitBookSiteContext; withTopHeader?: boo
                             )}
                         >
                             <HeaderMobileMenuButton
-                                pages={context.pages}
                                 className={tcls(
                                     'lg:hidden',
                                     '-ml-2',
diff --git a/packages/gitbook/src/components/Header/HeaderMobileMenuButton.tsx b/packages/gitbook/src/components/Header/HeaderMobileMenuButton.tsx
index 308c047fa..38834f048 100644
--- a/packages/gitbook/src/components/Header/HeaderMobileMenuButton.tsx
+++ b/packages/gitbook/src/components/Header/HeaderMobileMenuButton.tsx
@@ -6,18 +6,14 @@ import { useEffect } from 'react';
 import { useMobileMenuSheet } from '@/components/Header/mobile-menu/useMobileMenuSheet';
 import { tString, useLanguage } from '@/intl/client';
 import { tcls } from '@/lib/tailwind';
-import type { GitBookSiteContext } from '@v2/lib/context';
 import { usePathname } from 'next/navigation';
 
 /**
  * Button to show/hide the table of content on mobile.
  */
-export function HeaderMobileMenuButton({
-    pages,
-    ...props
-}: Partial<React.ButtonHTMLAttributes<HTMLButtonElement>> & {
-    pages: GitBookSiteContext['pages'];
-}) {
+export function HeaderMobileMenuButton(
+    props: Partial<React.ButtonHTMLAttributes<HTMLButtonElement>>
+) {
     const language = useLanguage();
     const pathname = usePathname();
     const { open, setOpen } = useMobileMenuSheet();
@@ -26,7 +22,7 @@ export function HeaderMobileMenuButton({
         setOpen(!open);
     };
 
-    // Close the navigation when navigating to a page
+    // biome-ignore lint/correctness/useExhaustiveDependencies: Close the navigation when navigating to a page
     useEffect(() => {
         if (!open) return;
         setOpen(false);
diff --git a/packages/gitbook/src/components/Header/SpacesDropdown.tsx b/packages/gitbook/src/components/Header/SpacesDropdown.tsx
index dd6887d95..8e5cc46aa 100644
--- a/packages/gitbook/src/components/Header/SpacesDropdown.tsx
+++ b/packages/gitbook/src/components/Header/SpacesDropdown.tsx
@@ -11,8 +11,9 @@ export function SpacesDropdown(props: {
     siteSpace: SiteSpace;
     siteSpaces: SiteSpace[];
     className?: string;
+    withPortal?: boolean;
 }) {
-    const { context, siteSpace, siteSpaces, className } = props;
+    const { context, siteSpace, siteSpaces, className, withPortal } = props;
 
     return (
         <DropdownMenu
@@ -20,6 +21,7 @@ export function SpacesDropdown(props: {
                 'group-hover/dropdown:invisible', // Prevent hover from opening the dropdown, as it's annoying in this context
                 'group-focus-within/dropdown:group-hover/dropdown:visible' // When the dropdown is already open, it should remain visible when hovered
             )}
+            withPortal={withPortal}
             button={
                 <div
                     data-testid="space-dropdown-button"
diff --git a/packages/gitbook/src/components/Header/mobile-menu/MobileMenuSheet.tsx b/packages/gitbook/src/components/Header/mobile-menu/MobileMenuSheet.tsx
index 214a443fb..5ccf148a3 100644
--- a/packages/gitbook/src/components/Header/mobile-menu/MobileMenuSheet.tsx
+++ b/packages/gitbook/src/components/Header/mobile-menu/MobileMenuSheet.tsx
@@ -9,7 +9,8 @@ import {
 } from '@/components/utils/Sheet';
 import { useMobileMenuSheet } from './useMobileMenuSheet';
 
-export function MobileMenuSheet({ children }: { children: React.ReactNode }) {
+export function MobileMenuSheet(props: { children: React.ReactNode }) {
+    const { children } = props;
     const { open, setOpen } = useMobileMenuSheet();
 
     return (
@@ -17,7 +18,7 @@ export function MobileMenuSheet({ children }: { children: React.ReactNode }) {
             <SheetContent
                 aria-label="Mobile menu"
                 overlayClassName="lg:hidden"
-                className="lg:hidden"
+                className="pb-2 lg:hidden"
             >
                 {/** Needed for screen readers */}
                 <SheetHeader className="sr-only">
diff --git a/packages/gitbook/src/components/SpaceLayout/SpaceLayout.tsx b/packages/gitbook/src/components/SpaceLayout/SpaceLayout.tsx
index 8d0d785d9..97b536cb4 100644
--- a/packages/gitbook/src/components/SpaceLayout/SpaceLayout.tsx
+++ b/packages/gitbook/src/components/SpaceLayout/SpaceLayout.tsx
@@ -73,13 +73,15 @@ export function SpaceLayout(props: {
                         innerHeader={
                             isMultiVariants ? (
                                 <SpacesDropdown
+                                    withPortal={false}
                                     context={context}
                                     siteSpace={siteSpace}
                                     siteSpaces={siteSpaces}
                                     className={tcls(
                                         'w-full',
                                         'page-no-toc:hidden',
-                                        'site-header-none:page-no-toc:flex'
+                                        'site-header-none:page-no-toc:flex',
+                                        'h-8'
                                     )}
                                 />
                             ) : null
diff --git a/packages/gitbook/src/components/TableOfContents/PageGroupItem.tsx b/packages/gitbook/src/components/TableOfContents/PageGroupItem.tsx
index 24ea366a2..60a400ca4 100644
--- a/packages/gitbook/src/components/TableOfContents/PageGroupItem.tsx
+++ b/packages/gitbook/src/components/TableOfContents/PageGroupItem.tsx
@@ -29,8 +29,8 @@ export function PageGroupItem(props: {
                     '[html.sidebar-filled.theme-bold.tint_&]:bg-tint-subtle',
                     '[html.sidebar-filled.theme-muted_&]:bg-tint-base',
                     '[html.sidebar-filled.theme-bold.tint_&]:bg-tint-base',
-                    '[html.sidebar-default.theme-gradient_&]:bg-gradient-primary',
-                    '[html.sidebar-default.theme-gradient.tint_&]:bg-gradient-tint'
+                    'lg:[html.sidebar-default.theme-gradient_&]:bg-gradient-primary',
+                    'lg:[html.sidebar-default.theme-gradient.tint_&]:bg-gradient-tint'
                 )}
             >
                 <TOCPageIcon page={page} />
diff --git a/packages/gitbook/src/components/TableOfContents/TOCScrollContent.tsx b/packages/gitbook/src/components/TableOfContents/TOCScrollContent.tsx
index f7696d61e..49cd30966 100644
--- a/packages/gitbook/src/components/TableOfContents/TOCScrollContent.tsx
+++ b/packages/gitbook/src/components/TableOfContents/TOCScrollContent.tsx
@@ -32,14 +32,14 @@ export function TOCScrollContent(props: {
             )}
         >
             {!!innerHeader && (
-                <div className="inline-flex w-full flex-col gap-2 px-3 *:mt-0.5 max-lg:mt-3 max-lg:pr-12 lg:px-2 lg:pr-4">
+                <div className="inline-flex w-full flex-col gap-2 px-2 max-lg:mt-2 max-lg:pr-12 lg:pr-4 lg:*:mt-0.5">
                     {innerHeader}
                 </div>
             )}
 
             <TOCScrollContainer // The scrollview inside the sidebar
                 className={tcls(
-                    'flex flex-grow flex-col p-3 lg:p-2',
+                    'flex flex-grow flex-col p-2',
                     innerHeader ? 'mt-0' : 'mt-8',
                     customization.trademark.enabled && 'pb-20',
                     'gutter-stable overflow-y-auto',
diff --git a/packages/gitbook/src/components/TableOfContents/Trademark.tsx b/packages/gitbook/src/components/TableOfContents/Trademark.tsx
index ca238103f..1380431b3 100644
--- a/packages/gitbook/src/components/TableOfContents/Trademark.tsx
+++ b/packages/gitbook/src/components/TableOfContents/Trademark.tsx
@@ -24,14 +24,13 @@ export function Trademark(props: {
                 'z-[2]',
                 'absolute',
 
-                'lg:left-0',
-                'lg:bottom-0',
                 'left-2',
                 'right-2',
-                'bottom-2',
+                'bottom-0',
+                'lg:left-0',
 
                 'pt-2',
-                'lg:py-0',
+                'lg:pt-0',
 
                 'pointer-events-none',
                 'sidebar-filled:pl-2',
diff --git a/packages/gitbook/src/components/primitives/Button.tsx b/packages/gitbook/src/components/primitives/Button.tsx
index 3d53d0502..e1724d71e 100644
--- a/packages/gitbook/src/components/primitives/Button.tsx
+++ b/packages/gitbook/src/components/primitives/Button.tsx
@@ -64,7 +64,7 @@ export function Button({
     const sizes = {
         default: ['text-base', 'py-2', 'circular-corners:px-6', iconOnly ? '!px-2' : 'px-5'],
         medium: ['text-sm', 'py-1.5', 'circular-corners:px-4', iconOnly ? '!px-1.5' : 'px-3.5'],
-        small: ['text-xs', 'py-2', iconOnly ? 'px-2' : 'px-3'],
+        small: ['text-xs', 'py-2', iconOnly ? '!px-2' : 'px-3'],
     };
 
     const sizeClasses = sizes[size] || sizes.default;
diff --git a/packages/gitbook/src/components/utils/Sheet.tsx b/packages/gitbook/src/components/utils/Sheet.tsx
index 59671f58e..755d453b3 100644
--- a/packages/gitbook/src/components/utils/Sheet.tsx
+++ b/packages/gitbook/src/components/utils/Sheet.tsx
@@ -49,23 +49,38 @@ export function SheetContent({
     side?: 'right' | 'left';
 }) {
     return (
-        <>
+        <SheetPortal>
             <SheetOverlay className={overlayClassName} />
             <SheetPrimitive.Content
                 data-slot="sheet-content"
                 className={tcls(
-                    'fixed z-30 flex flex-col rounded-xl shadow-lg transition ease-in-out data-[state=closed]:duration-300 data-[state=open]:duration-500',
+                    'fixed',
+                    'z-30',
+                    'flex',
+                    'flex-col',
+                    'shadow-lg',
+                    'depth-flat:shadow-none',
+
+                    'transition ease-in-out',
+                    'data-[state=closed]:duration-300 data-[state=open]:duration-500',
+
+                    'border',
                     'border-tint-subtle',
-                    'inset-x-1.5 inset-y-1.5 w-10/12 border sm:max-w-sm',
+
+                    'inset-x-1.5',
+                    'inset-y-1.5',
+
+                    'w-10/12',
+                    'sm:max-w-sm',
+
                     'bg-tint-base',
-                    'theme-gradient:bg-gradient-primary',
-                    'sidebar-filled:bg-tint-subtle',
-                    'theme-muted:bg-tint-subtle',
                     'sidebar-filled:bg-tint-subtle',
                     'theme-muted:bg-tint-subtle',
                     '[html.sidebar-filled.theme-bold.tint_&]:bg-tint-subtle',
                     '[html.sidebar-filled.theme-muted_&]:bg-tint-base',
                     '[html.sidebar-filled.theme-bold.tint_&]:bg-tint-base',
+
+                    'rounded-xl',
                     'circular-corners:rounded-2xl',
                     'straight-corners:rounded-none',
                     side === 'right' &&
@@ -80,18 +95,17 @@ export function SheetContent({
 
                 <SheetClose asChild>
                     <Button
-                        data-slot="sheet-close"
-                        variant="blank"
+                        variant="secondary"
                         icon="close"
                         iconOnly
-                        size="default"
-                        className="absolute top-3 right-2 z-50"
+                        autoFocus={false}
+                        className="absolute top-2 right-2 z-50 bg-transparent text-tint opacity-8 shadow-none ring-transparent"
                     >
                         <span className="sr-only">Close</span>
                     </Button>
                 </SheetClose>
             </SheetPrimitive.Content>
-        </>
+        </SheetPortal>
     );
 }