Some Canva apps appear in black or grey, making the elements underneath difficult to see. As a workaround, we suggest changing your Canva theme from Light to Dark under the Accessibility: https://www.canva.com/settings/accessibility
Event: We are aware that apps created after 2026-01-21 00:00:00 UTC are generated with an ID that contain an underscore which results in developers experiencing CORS issues and unable to test locally. Workaround: Please use Firefox as your browser for now, which should allow you to continue testing. We're actively working on a fix and will share more details about the specific issue shortly. Thanks for your patience, and apologies for the disruption to your workflow.