Button component issue online

OS: Windows 11
PsychoPy version: 2025.1.1

When I run my experiment online, my button component appears as a huge black blob on one side of the screen. When I run locally, it looks fine. I’ve created it in builder and used code components to specify its appearance, but that doesn’t do anything. If anyone has advice please let me know!

Please could you show your button and code? Is the code in AutoJS components? Can you use the button component to specify more of the appearance?