mediawiki-skins-Vector/resources/skins.vector.styles/components/PageTitlebar.less

.vector-page-titlebar {
	display: flex;
	// Ensure language button or indicators are positioned to the right even when the title is hidden
	justify-content: flex-end;
	// Use box-shadow instead of border to allow border collapsing between titlebar and toolbar
	box-shadow: 0 1px @border-color-base;

	&-blank {
		box-shadow: none;
	}

	.firstHeading {
		flex-grow: 1;
		border: 0;
	}
}