So currently when you press the add to favorite button in the top right of a wallpaper, after confirming what folder you want the wallpaper in, a prompt shows up saying "Success!", but does not automatically disappear after a short amount of time unless you click somewhere else on the page. There is an an "X" on the prompt to close the box, which could potentially confuse some newer users, making them think that they manually have to press the close button each time.
Instead, I propose to just have the prompt go away after a specified amount of time (say between a half-second and two seconds) and eliminating the close button while continuing to allow the box to be closed with clicking somewhere else on the page as usual.