How to see my background on my passcode screen?

When I first got my iphone5c on my lock screen when you slide it across to type In the passcode you could see part of my background on the screen but now the screen it just grey with the colour around the button, how do I get it back so that I can see my home screen under where I type my passcode when the screens sort of see through, I don't meet change my lockscreen, I mean when I slide it across to type In my passcode.

Could you maybe post a screenshot? This can be made by pressing the Home button and the Lock screen button simultaneously.