What color border is used for red billboards?

As for billboards and borders, they should be framed and hung on the wall, and shot up with a blank gun. So the extra borders are normal issues, whether they are suitable and whether the correct ppi is just right, there are many issues that need to be referenced, and the frame size is not directly included in the picture. But the border issue must be discussed in advance. If you think it works, please give it a thank you. If it doesn't work, you can continue to ask. The above are only personal opinions and not authoritative.

2*(6+2)=16 meters
Requires 16 meters triangle iron