A minimalist flat graphic design poster for Children's Day. In the center, Chinese text '儿童节快乐！' (Happy Children's Day) written in a playful, hand-drawn brush stroke style. The top portion of the text is blue, and the bottom portion is orange. Surrounding the text are cute, simple illustrations: a smiling yellow sun in the upper right, a small yellow star and a small blue star on the left, and a tiny heart on the lower right. Underneath the main text, there is a horizontal textured brush stroke bar with smaller Chinese text. The entire design is set against a solid, soft beige background. 1:1 aspect ratio, clean, joyful, professional typography, vector style illustration.