Wikipedia:Village pump (technical)#WP:Notifications in Modern skin
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Hover over is white type on a white background.
Both are seemingly addressed in mw.echo.ui.NotificationOptionWidget.modern.less and mw.echo.ui.NotificationBadgeWidget.modern.less but being overridden.
.mw-echo-ui-notificationOptionWidget { #p-personal & a, #p-personal & a.new { // In modern, the hover color is white, which is unhelpful. color: #666666; text-decoration: none; } }
.mw-echo-ui-notificationBadgeButtonPopupWidget { font-variant: normal; text-transform: none; font-weight: normal; // Badge > .oo-ui-buttonElement-button { border-radius: none; } }