完美

src/components/PreviewGrid.tsx

@@ -721,8 +721,8 @@ export const LayoutPreview: React.FC<LayoutPreviewProps> = ({
           <div
             className={
               isMobileVariant
-                ? 'flex flex-col items-center space-y-4 pb-4'
-                : 'flex flex-wrap justify-center content-start w-full pb-8'
+                ? 'flex flex-col items-center justify-center min-h-full w-full space-y-4 pb-4'
+                : 'flex flex-wrap justify-center content-center w-full min-h-full pb-8'
             }
             style={isMobileVariant ? undefined : { gap: `${previewPageGapPx}px` }}
           >
@@ -741,7 +741,7 @@ export const LayoutPreview: React.FC<LayoutPreviewProps> = ({
                   </span> */}
                 </div>
                 <div
-                  className="bg-white flex items-start justify-start relative select-none overflow-hidden shrink-0"
+                  className="bg-white flex items-center justify-center relative select-none overflow-hidden shrink-0"
                   style={{
                     width: `${pageCardWidthPx}px`,
                     height: `${currentPaperH * previewScale}px`,

src/components/PropSidebar.tsx

@@ -2324,17 +2324,18 @@ export const PropSidebar: React.FC<PropSidebarProps> = ({
               <span>粘贴</span>
             </button>
           )}
-          <button
-            type="button"
-            onClick={() => elementClipboard?.copySelectedElements()}
-            disabled={!elementClipboard?.canCopy}
-            className="mobile-design-props-nav-btn"
-            aria-label="复制选中元素"
-            title="复制选中元素"
-          >
-            <Copy className="w-4 h-4" />
-            <span>复制</span>
-          </button>
+          {elementClipboard?.canCopy && (
+            <button
+              type="button"
+              onClick={() => elementClipboard.copySelectedElements()}
+              className="mobile-design-props-nav-btn"
+              aria-label="复制选中元素"
+              title="复制选中元素"
+            >
+              <Copy className="w-4 h-4" />
+              <span>复制</span>
+            </button>
+          )}
           <button
             type="button"
             onClick={() => void deleteSelectedElements()}