80s retro sci-fi palm trees on a sunset in triangular frame. retro futuristic sun with palm trees. synthwave and retrowave style.

1980 80s synthwave abstract backdrop background banner beach bright design frame cyberpunk flyer funky future futuristic galaxy geometric hipster icon blue border purple retrowave night palm party virtual poster pink gradient retro scifi sky space style summer sun sunset synth template tree trendy tropic tropical vector vibrant vintage triangle sci-fi trees triangular frame trees style advertising banners posters