Yahoo Mail Change Appearance

I have some accounts on Yahoo Mail, as usually to check mail. I notice one of my account have been change the appearance. Before that the background is Blue and White. Now with full white background. How about your account? Have been changed? This is happened to just one account. Maybe this is an of an update from yahoo for unlimited email space. You can see the different the image below.

Old:

New:

We wait for other update from Yahoo