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Mapco and Ansum apply `transition: all 0.2s ease-in-out` to `.aside` in their narrow `@media`. When the viewport crosses 840px with the sidebar open, the resulting `.aside` position change (`static` to `fixed`) gets animated alongside width, producing a visible artefact where the X button slides down then scrolls back up before settling. Limit the transition to the property that should actually animate (`width`), matching base-theme's existing `transition: width 200ms linear`. The artefact only manifests when the drawer stays open across the 840px boundary, which is the behaviour introduced by #8775. On current edge, `init_nav_menu`'s `media.onchange` toggles the aside off when crossing the breakpoint, hiding the bug. Co-authored-by: Bjørn A. Andersen <polybjorn@users.noreply.github.com>