Earlier, the iPhone maker began testing a major redesign to the iCloud Mail experience on the web, which brought its webmail service more in line with design changes made in macOS Big Sur.
The new design looked more similar to the Mail app which was available on the iPad and Mac, as it featured a cleaner interface with thicker icons.
It seemed that Apple finally brought a more modern look to the iCloud web, starting with Mail -- other iCloud web apps were still with the old design even on the beta website.