For an optimal viewing experience:

STEP 1: CLICK HERE to enable your device's motion sensors.

STEP 1: Looks like you've already enabled your motion sensors!

STEP 1: Enable your device's motion sensors.
iOS 12 users: Settings > Safari > Motion & Orientation Access.

STEP 2: Extend the sleep settings on your phone.

STEP 3: Close all other open browser tabs.

STEP 4: Tilt your phone to portrait mode and back to landsape to enter full screen mode.