subtle, simple, dark theme, background, 4k, beautiful,minimalistic pattern, 
subtle, simple, dark theme, background, 4k, beautiful,minimalistic pattern, --ar 16:9
subtle
simple, dark theme, background, 4k, beautiful,minimalistic pattern,
a black background with a diamond pattern
a black abstract background with wavy lines
a black background with cubes on it
a black background with geometric shapes