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frontend/src/pages/FirstLoginRewardPage.tsx

@@ -476,6 +476,27 @@ export const FirstLoginRewardPage = () => {
                         }}
                       />
                     )}
+                    {/* 当前图片的旋转副本（作为背景） */}
+                    <img
+                      src={shareImages[activeShareIndex]?.url}
+                      alt="Share preview background"
+                      aria-hidden
+                      style={{
+                        position: 'absolute',
+                        left: '50%',
+                        top: 0,
+                        width: '100%',
+                        height: 'auto',
+                        display: 'block',
+                        borderRadius: px2vmin(12),
+                        boxShadow: 'none',
+                        transformOrigin: 'left bottom',
+                        transform: 'translateX(-50%) rotate(1.55deg)',
+                        zIndex: 0.5,
+                        pointerEvents: 'none',
+                      }}
+                    />
+                    {/* 当前图片 */}
                     <img
                       src={shareImages[activeShareIndex]?.url}
                       alt="Share preview"