Need help on a tunnel

Im new on essentials, and I would like to make a place that looks like the player is passing down the stone, but i dont know how i can do it, if its with a script or that i cant do it.
link to the image, as it seems that doesent want to load https://ibb.co/h6wPhd

If you want to make a tunnel like effect, you can do one of the following:
1) If you want the character able to go above the tunnel as well as below, you can make a copy of those tiles and add the bridge terrain tag to them. (More info here: http://pokemonessentials.wikia.com/wiki/Bridges)

2) If you want to make a simple tunnel where the player can't go above, just copy those tiles, paste them somewhere, and add priority to them. It's a simpler solution.