Problem with iPhone password?

Notice when you type in your password it's connected to your background and is different colors? For some reason on my iPhone 5s when I go to type in my password it's just one blank color… Anyone know why or how I can fix it.

Can you give us a screenshot of before and after? Is this for iOS 7?

Go into Settings > Wallpapers & Brightness, and select a new wallpaper. The wallpaper for the lock screen can be set separately from the wallpaper for the home screen.

If the icons and such on the screen are not translucent, you might have high contrast set in Settings > General > Accessibility > Increase contrast, although this is turned off by default.