A subtle abstract pattern background, featuring soft wave or circle motifs in different shades of grey. The background color is #d3d3d3, with the abstract shapes very lightly contrasting in #f0f0f0 or slightly darker grey #b0b0b0. The design is minimalist, calm, and balanced, with a modern touch. Image dimensions 1920x700, quiet and not too colorful  --ar 96:35