時間割ストリップラベル

A blank long horizontal timetable strip label with rounded ends and a thin double outline PNG asset for diary decoration, object only, visible colored outer frame or label border, clear writable center area, clean smooth inner edge and outer edge, no text, centered on a solid light gray background, generous empty margin, no white outline, no sticker border, no cut edge, 1024x1024.
Background removal requirements: single isolated design element, centered composition, solid light gray background, flat uniform light gray backdrop, high contrast between the design and the background, smooth edges, generous empty margin around the design, flat planner PNG asset style.
Open-center shape requirement: if the asset is a frame, label, or speech bubble, the center must remain visually open in the original image by showing the light gray background through the inside area; do not fill the center with color.
Flatness requirements: flat vector illustration, no depth, completely flat, 2D only, no lighting direction, no realistic shading.
Shadow layer ban: no drop shadow, no cast shadow, no ambient occlusion, no contact shadow, no soft gray halo, no shadow under or around the asset.
Effect ban: no 3D effect, no bevel, no emboss, no paper lift, no raised edge, no glow.
Edge construction: object only, clean edges, no white outline, no sticker border, no cut edge, no separate border layer.
Avoid: no drop shadow, no cast shadow, no ambient occlusion, no reflection, no glow, no textured background, no gradient background, no photo realism, no mockup scene, no hand holding the asset, no white outline, no sticker border, no cut edge, no die-cut edge.