These aren't the droids you're looking for
Move along now.
Alert-Dialog is headless UI widget and does not come bundled with any CSS.
This example is receiving its base markup and styles from eBay Skin. A subset of style properties are being customized/themed via Skin's CSS Custom Properties.
This page was loaded with the dialog in an "open" state. To see examples of dialogs opened by button click, visit the makeup-dialog-button page.
Move along now.