How to close the Apps that are running in the background (iOS7)

Similar to the previous version, first you have to double-press the home button, instead of the apps showing up on the lower portion of thr screen, im iOS 7 it willl take you to another screen where you will be able to see the preview of the app along with the icon on the bottom. In order to close it, simply touch and swipe up on the preview of the App