<p><a href="https://github.com/tomhughes" class="user-mention">@tomhughes</a> tooltips on the layer selector panel have an additional <a href="https://github.com/openstreetmap/openstreetmap-website/blob/master/app/assets/stylesheets/common.css.scss#L715-L721">1px border</a>. Maybe that could help on the sidebar, too?</p>

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