For many people, a smartphone has long become the main source of information, entertainment, and various services. Web resource owners should definitely keep up with such tendencies, providing Android & iOS users with a smooth performance that doesn’t consume too many resources.

That is exactly the reason why the largest market players started actively introducing PWAs – progressive web apps. However, it’s not all about performance. A picture tells a thousand words, as they say, so the user interface of any PWA solution is the first and foremost thing to impact users that launch the app for the time ever.

That’s why it is important to keep up with the relevant design trends, use handy design tools, and not neglect the best practices employed by large market players in order to achieve an impeccable quality the PWA interface and reach for the best user experience possible.
https://multi-programming.com/blog/ui-design-for-a-progressive-web-app-that-sticks-tips-tricks