UpdatePanelAnimationExtender FadeIn FadeOut problem-page resize issue

Basically the problem is after animation worked page is not resize properly.what i did is put div tag name it as rightContainer and place the code whithing it what i need to update.Then Set the  AnimationTarget="rightContainer".

Here the Code.

<FadeIn AnimationTarget="rightContainer" minimumOpacity=".6" />
<FadeOut AnimationTarget="rightContainer" minimumOpacity=".6" />