diff --git a/src/renderer/src/components/CleanerOperationHistoryModal.tsx b/src/renderer/src/components/CleanerOperationHistoryModal.tsx
index 79c91a5..84d0c4e 100644
--- a/src/renderer/src/components/CleanerOperationHistoryModal.tsx
+++ b/src/renderer/src/components/CleanerOperationHistoryModal.tsx
@@ -749,7 +749,7 @@ export const CleanerOperationHistoryModal: React.FC<CleanerOperationHistoryModal
   if (!isOpen) return null
 
   return (
-    <Modal isOpen={isOpen} onClose={onClose} title="清理操作历史" size="3xl">
+    <Modal isOpen={isOpen} onClose={onClose} title="清理操作历史" size="3xl" className="!max-w-[68rem]">
       <div className="flex flex-col h-[70vh]">
         {/* Toolbar */}
         <div className="flex items-start justify-between mb-4 pb-4 border-b border-gray-200">
diff --git a/src/renderer/src/components/ui/Modal.tsx b/src/renderer/src/components/ui/Modal.tsx
index 90a8cfd..a555c8b 100644
--- a/src/renderer/src/components/ui/Modal.tsx
+++ b/src/renderer/src/components/ui/Modal.tsx
@@ -15,6 +15,8 @@ interface ModalProps {
   title?: string
   children: React.ReactNode
   size?: 'sm' | 'md' | 'lg' | 'xl' | '2xl' | '3xl'
+  /** Additional CSS classes for the modal panel */
+  className?: string
   showCloseButton?: boolean
   /** Ref to the element that triggered opening the modal (for focus restoration) */
   triggerRef?: React.RefObject<HTMLElement | null>
@@ -47,6 +49,7 @@ export function Modal({
   title,
   children,
   size = 'md',
+  className,
   showCloseButton = true,
   triggerRef,
   titleId,
@@ -98,7 +101,7 @@ export function Modal({
         <div className="flex min-h-full items-center justify-center p-4">
           <div
             ref={dialogRef}
-            className={`relative w-full ${sizeStyles[size]} bg-white rounded-lg shadow-xl transform transition-all`}
+            className={`relative w-full ${sizeStyles[size]} bg-white rounded-lg shadow-xl transform transition-all ${className || ''}`}
             onClick={(e) => e.stopPropagation()}
           >
             {/* Header */}