diff --git a/packages/popper/index.ts b/packages/popper/index.ts
index df9b7ccf6e..4d45212cfd 100644
--- a/packages/popper/index.ts
+++ b/packages/popper/index.ts
@@ -10,7 +10,8 @@ const _Popper: SFCWithInstall<typeof Popper> = Popper
 
 export default _Popper
 
-export { default as defaultProps, Effect, Placement, Options } from './src/use-popper/defaults'
+export { default as defaultProps, Effect } from './src/use-popper/defaults'
+export type { Placement, Options } from '@popperjs/core'
 export type { TriggerType, IPopperOptions, PopperInstance } from './src/use-popper/defaults'
 export { default as usePopper } from './src/use-popper/index'
 export * from './src/renderers/index'
diff --git a/packages/theme-chalk/src/common/transition.scss b/packages/theme-chalk/src/common/transition.scss
index 34d64966f6..037b59de12 100644
--- a/packages/theme-chalk/src/common/transition.scss
+++ b/packages/theme-chalk/src/common/transition.scss
@@ -4,9 +4,9 @@
 .fade-in-linear-leave-active {
   transition: $--fade-linear-transition;
 }
+
 .fade-in-linear-enter-from,
-.fade-in-linear-leave-from,
-.fade-in-linear-leave-active {
+.fade-in-linear-leave-to {
   opacity: 0;
 }
 
@@ -15,8 +15,7 @@
   transition: $--fade-linear-transition;
 }
 .el-fade-in-linear-enter-from,
-.el-fade-in-linear-leave-from,
-.el-fade-in-linear-leave-active {
+.el-fade-in-linear-leave-to {
   opacity: 0;
 }