Rotate your device to landscape mode for a better view.



On touchscreen devices you can use a finger to navigate, or use built in motion sensors and gyroscope. In iOS 12 or newer, you must give the player permission to use sensors.

On iPhones the browsers may limit full screen viewing if there are many tabs open. Try closing all tabs, and retry.
If the image still won't display full screen, try rotating your device to portrait mode, and back to landscape.