The Web Error Guide’s mobile “scan your site” box was rendering at the wrong size despite its own CSS looking correct in isolation. A sitewide WPCode snippet was silently overriding its sizing on mobile, because that snippet targeted a shared, generically-named class this page also happened to reuse.
A Shared, Generic CSS Class Name Collided With a Site-Wide !important Rule
Field Note #304
⚡ Quick Fix (TL;DR)
The Culprit: Reusing a short, generic class prefix across more than one feature meant a plugin pattern-matching on that prefix unintentionally reached a page it was never meant to affect.
The Fix: Renamed the affected page's classes to a fully page-specific prefix so no other snippet's selectors can ever reach it again, rather than trying to out-specificity the original !important rule. A second, unrelated bug (the scan form's submit button not actually wired up) was found and fixed in the same pass.
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