openstreetmap-website

This affects banners configured in config/banners.yml, not the welcome banner. The close action applies inline display: none, but Bootstrap's d-md-block class applies display: block !important at medium widths and overrides it. As an end-user workaround, reload the page; the dismissal cookie then hides the banner. For the code fix, remove d-md-block when the close button is clicked in app/views/layouts/_banner.html.erb or its associated banner JavaScript: const banner = document.getElementById('banner'); banner.classList.remove('d-md-block'); banner.style.display = 'none';. If the banner uses d-none d-md-block, removing only d-md-block leaves d-none applied, which correctly hides it.

Set clear contribution guidelines that require proof of local testing (e.g., screenshots, test output). Use automated CI checks to catch syntax errors. For PRs that show no effort, close with a polite template message asking the contributor to verify their changes and review the guidelines before resubmitting. Optionally, add a CONTRIBUTING.md file that explicitly discourages raw AI-generated submissions without human review.