Comment by jfg

For me, you can target the sidebar with the rule: div[data-testid="sidebarColumn"] .r-1u4rsef

and promoted tweets (in light mode): .css-1dbjc4n.r-my5ep6.r-qklmqi.r-1adg3ll div[data-testid="placementTracking"]:not(.r-u8s1d)

Obviously very fragile, but has been working fo the last month or so