Customize Bouncer using CSS overrides
You can style the pop-up and the background image via CSS by targeting their unique ID's.
The <div> element that contains the background image has the following ID:
The pop-up itself has the following ID:
The various element ID's within the pop-up are as follows:
#bouncer_modal_subheading #bouncer_modal_datepicker select #bouncer_modal_submit #bouncer_modal_exit
Be sure to use the !important flag with style declarations to override predefined attributes.