MAP POPUP

 POPUP IS ADDED TO THE MAP.

const marker = new mapboxgl.Marker({ color: "red" })

  .setLngLat(listing.geometry.coordinates)

  .setPopup(

    new mapboxgl.Popup({ offset: 25 }).setHTML(

      `<h5>Welcome to ${listing.title}</h5> `

    )

  )

  .addTo(map);