pixelated zig zag line gradient texture. black dithered gradation background. retro bitmap video game wallpaper. vintage

pixel gradient zig zag bitmap wave texture dither bit gradation background fade overlay arcade white dot art glow geometric wiggle light repeat black game tone pattern block mosaic vector shape abstract effect blend retro noise speckle bg halftone glitch monochrome console border grain digital squiggle undulate billowy curve serrated