Idea Challenge-2021 Poster–October-1st Sizes: 150 × 150 / 300 × 300 / 768 × 768 / 1,024 × 1,024 / 250 × 250 / 600 × 400 / 300 × 200 / 400 × 200 / 130 × 90 / 500 × 500 / 272 × 182 / 1,080 × 1,080
