Fog down to the runway. No wind. Every light, radio and computer works. You sit in the left seat of a widebody, and the runway is somewhere in that gray.
Approach
Fog
Options
How to land in fog
Autoland: press L any time. It captures the localizer and glideslope, slows down, lowers the gear and flaps, flares, and brakes to a stop. Press L again, or touch the stick, to take over.
By hand: put the round flight-path marker inside the ring. The ring is the flight director. The stick sets your flight path; let go and the jet holds it.
Keep the magenta diamonds centered. The bottom one is the localizer (left/right). The right one is the glideslope (up/down).
Be stable by 1000 ft: gear down, flaps FULL, about 143 kt. Z turns on the autothrottle.
Flare at about 50 ft: ease the nose up so you touch down at 100-200 ft/min. Idle thrust at "retard".
After touchdown: S/W lowers the nose, A/D steer, X reverse thrust, autobrake stops you.
Not sure? Press T. A go-around is always a safe answer.