A computer-implemented method displays a shopping cart user interface showing an electronic shopping cart for an anonymous user and receives an input indicating a selection of a sign-in control. An overlay is displayed over the shopping cart user interface such that a portion of the shopping cart user interface is displayed through the overlay and the overlay provides text inputs to receive information for creating a user account. An indication that a user wishes to submit information in the text inputs to create a user account is received. The text inputs are submitted to a server and an indication that the user account was created is received. An indication that the user account was successfully created is displayed within the overlay.