Do you catch yourself redesigning the landing page instead of building the app?

It is so easy to fall into the trap of redesigning your landing page hero section four times before the actual app logic even functions. tweaking gradients, adjusting border radii and swapping fonts feels like real work, but it is just a clever way to procrastinate on writing difficult backend code. I now build the ugliest functional UI possible first and ban myself from touching CSS until the core workflow is tested.

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How do you keep yourself focused on building functionality instead of tweaking pixels too early?