Could just look like this. It’s a dumb little stopwatch app I made some time ago to explain a different concept. All it uses is plain HTML, CSS, and Javascript. Because I could use emojis as icons, I didn’t need to bring in a separate icon pack.
If I didn’t have access to emojis at all, I probably would have just used text only… But if I’m prototyping an app that I’m building for someone else, it helps make it look closer to the real thing, and that’s kinda nice.