diff --git a/frontend/src/components/PageHeaderActions.jsx b/frontend/src/components/PageHeaderActions.jsx
index 54765a3..cb59bbc 100644
--- a/frontend/src/components/PageHeaderActions.jsx
+++ b/frontend/src/components/PageHeaderActions.jsx
@@ -6,6 +6,7 @@ import {
   IconPlayerPlay,
   IconBolt
 } from '@tabler/icons-react';
+import PortalDropdown from './PortalDropdown.jsx';
 
 function PageHeaderActions({
   loading = false,
@@ -39,17 +40,19 @@ function PageHeaderActions({
               <IconPlayerPlay className="me-1" /> Фоновое обновление
             </button>
             {(onBackgroundUpdate && onOnlineUpdate) && (
-              <>
-                <button className="btn btn-outline-success dropdown-toggle dropdown-toggle-split" type="button" data-bs-toggle="dropdown" data-bs-container="body" aria-expanded="false" aria-label="Другие варианты обновления"></button>
-                <div className="dropdown-menu">
-                  <button className="dropdown-item" type="button" onClick={onBackgroundUpdate}>
-                    <IconPlayerPlay className="me-1" /> Фоновое обновление
-                  </button>
-                  <button className="dropdown-item" type="button" onClick={onOnlineUpdate}>
-                    <IconBolt className="me-1" /> Online-обновление
-                  </button>
-                </div>
-              </>
+              <PortalDropdown
+                buttonClassName="btn btn-outline-success dropdown-toggle dropdown-toggle-split"
+                buttonProps={{ 'aria-label': 'Другие варианты обновления' }}
+                align="right"
+                buttonContent={null}
+              >
+                <button className="dropdown-item" type="button" onClick={onBackgroundUpdate}>
+                  <IconPlayerPlay className="me-1" /> Фоновое обновление
+                </button>
+                <button className="dropdown-item" type="button" onClick={onOnlineUpdate}>
+                  <IconBolt className="me-1" /> Online-обновление
+                </button>
+              </PortalDropdown>
             )}
           </div>
         )}
@@ -63,10 +66,12 @@ function PageHeaderActions({
         )}
         {(onImport || onExport) && (
           <div className="dropdown">
-            <button className="btn btn-outline-primary dropdown-toggle" type="button" data-bs-toggle="dropdown" data-bs-container="body" aria-expanded="false" title="Импорт/Экспорт">
-              <IconDownload className="me-1" /> Импорт/Экспорт
-            </button>
-            <div className="dropdown-menu">
+            <PortalDropdown
+              buttonClassName="btn btn-outline-primary dropdown-toggle"
+              buttonProps={{ title: 'Импорт/Экспорт' }}
+              align="left"
+              buttonContent={<><IconDownload className="me-1" /> Импорт/Экспорт</>}
+            >
               {onImport && (
                 <button className="dropdown-item" type="button" onClick={onImport}>
                   <IconUpload className="me-1" /> Импорт
@@ -77,7 +82,7 @@ function PageHeaderActions({
                   <IconDownload className="me-1" /> Экспорт
                 </button>
               )}
-            </div>
+            </PortalDropdown>
           </div>
         )}
         {onClear && (
diff --git a/frontend/src/components/PortalDropdown.jsx b/frontend/src/components/PortalDropdown.jsx
new file mode 100644
index 0000000..1b98581
--- /dev/null
+++ b/frontend/src/components/PortalDropdown.jsx
@@ -0,0 +1,95 @@
+import { useEffect, useLayoutEffect, useRef, useState } from 'react';
+import { createPortal } from 'react-dom';
+
+function getBody() {
+  if (typeof document === 'undefined') return null;
+  return document.body;
+}
+
+function PortalDropdown({
+  buttonClassName = 'btn btn-outline-secondary dropdown-toggle',
+  buttonProps = {},
+  align = 'left',
+  children,
+  buttonContent,
+  menuClassName = 'dropdown-menu show',
+}) {
+  const buttonRef = useRef(null);
+  const menuRef = useRef(null);
+  const [open, setOpen] = useState(false);
+  const [coords, setCoords] = useState({ top: 0, left: 0, minWidth: 0 });
+
+  const updatePosition = () => {
+    const btn = buttonRef.current;
+    if (!btn) return;
+    const rect = btn.getBoundingClientRect();
+    const minWidth = rect.width; // make menu at least as wide as button
+    let left = rect.left;
+    if (align === 'right') {
+      const menu = menuRef.current;
+      const menuWidth = menu ? menu.offsetWidth : 0;
+      left = Math.max(0, rect.right - (menuWidth || rect.width));
+    }
+    setCoords({ top: rect.bottom + window.scrollY, left: left + window.scrollX, minWidth });
+  };
+
+  useLayoutEffect(() => {
+    if (open) updatePosition();
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, [open]);
+
+  useEffect(() => {
+    if (!open) return;
+    const onScroll = () => updatePosition();
+    const onResize = () => updatePosition();
+    const onKey = (e) => { if (e.key === 'Escape') setOpen(false); };
+    const onClickOutside = (e) => {
+      if (!menuRef.current || !buttonRef.current) return;
+      if (!menuRef.current.contains(e.target) && !buttonRef.current.contains(e.target)) {
+        setOpen(false);
+      }
+    };
+    window.addEventListener('scroll', onScroll, true);
+    window.addEventListener('resize', onResize);
+    document.addEventListener('keydown', onKey);
+    document.addEventListener('mousedown', onClickOutside);
+    return () => {
+      window.removeEventListener('scroll', onScroll, true);
+      window.removeEventListener('resize', onResize);
+      document.removeEventListener('keydown', onKey);
+      document.removeEventListener('mousedown', onClickOutside);
+    };
+  }, [open]);
+
+  const body = getBody();
+
+  return (
+    <>
+      <button
+        {...buttonProps}
+        ref={buttonRef}
+        type="button"
+        className={buttonClassName}
+        onClick={(e) => { e.preventDefault(); setOpen((v) => !v); }}
+        aria-expanded={open ? 'true' : 'false'}
+      >
+        {buttonContent}
+      </button>
+      {open && body && createPortal(
+        <div
+          ref={menuRef}
+          style={{ position: 'absolute', top: `${coords.top}px`, left: `${coords.left}px`, zIndex: 10000, minWidth: `${coords.minWidth}px` }}
+        >
+          <div className={menuClassName} style={{ display: 'block' }}>
+            {children}
+          </div>
+        </div>,
+        body
+      )}
+    </>
+  );
+}
+
+export default PortalDropdown;
+
+