A standard homepage big banner size is 905 x 375 px.
Other banner sizes:
1. Central banner with navigation on the left side – 905 px width / height at discretion.
2. Full width banner – 1216 px width / height at discretion.
3. Sidebar block banner with frame – 230 px width / height at discretion.
4. Sidebar block banner, full width – 282 px width / height at discretion.
5. Mobile version central banner – 395 px width / height at discretion.
6. Other full screen width banners – 290 px width / height at discretion.