Originally commented in #216511 (comment) but that's a different issue

Was just looking at this and I think it's because the padding is not balanced. It has padding-left: 2px here https://github.com/microsoft/vscode/blob/main/src/vs/workbench/contrib/notebook/browser/media/notebookToolbar.css#L66 all other sides are 3px

But we shouldn't naively change that to 3 and change the spacing of all items. Maybe can make it spin inside the padding instead of spinning the padding. Or just change the padding for rotating elements. cc @rebornix