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frontend/node_modules/antd/es/affix/style/index.js

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+import { genStyleHooks } from '../../theme/internal';
+// ============================== Shared ==============================
+const genSharedAffixStyle = token => {
+  const {
+    componentCls
+  } = token;
+  return {
+    [componentCls]: {
+      position: 'fixed',
+      zIndex: token.zIndexPopup
+    }
+  };
+};
+export const prepareComponentToken = token => ({
+  zIndexPopup: token.zIndexBase + 10
+});
+// ============================== Export ==============================
+export default genStyleHooks('Affix', genSharedAffixStyle, prepareComponentToken);