[Feature Request] [UI] [Web] improve the ui

[glitch128]

Quick summary

this isn't a bug, but I think that the UI of the emulator could be improved. on page load, the canvas would be hidden, and when a file is uploaded, the canvas would show, and the other elements would be hidden.
if you would want me to provide a mockup, I can make one.

System Details

Describe the ambient being used to run Play!
Information needed:

• Operating system (including the version)
• Hardware (GPU and CPU, for android you can search for your device model here https://www.gsmarena.com/ for specifications)
• Version of Play!
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Issue Details

Describe in details the problem you had and the expected behavior
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Screenshots/Videos

Drag and drop (or link to) videos or images that could help us understand the problem.
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