html:before { content: 'Webpack assets added successfully! See app/webpack/css/.'; display: block; padding: 20px; background: ffc; color: #111; position: fixed; top: 16px; right: 16px; max-width: 600px; z-index: 10000; font-family: sans-serif; font-size: 14px; line-height: 1.6; }