For Flash Theme:
Banner Size: 640px (width) x 320px (height)
Category Picture Size: 1080px (width) x 1080px (height)
For All Other Themes:
Banner Size: 1296px (width) x 544px (height)
Category Picture Size: 1080px (width) x 1080px (height)
Ensure your images match these dimensions for a visually consistent and appealing website layout.