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The Pop!_OS boot screen is designed to display while the OS is loading (typically a very short time), as well as when there is a message or input required from the user.
Normally, the boot is very fast so we just want to display an all-black screen (to avoid flashing between black and a fast boot screen). We should test if a blank brand warm gray background feels cleaner transitioning to GDM, but I suspect it will just add more potential for flashing.
Blue Pop! logo at 128px. 64px padding below.
48px version of Pop! drive-harddisk icon with 32px dialog-password overlaid at the bottom-right. 16px padding to right. 400px-wide entry, 24px tall. 2px brand orange bottom border. 8px round "dot" to mask typed characters. 12px "Enter" arrow logo inset on right-side when there is text in the box (if possible, otherwise, always shown).
All horizontally and vertically-centered as a group.
The text-entry cursor should blink if possible; if not, it should be always-visible to help hint that users can type in this entry.
If the display is HiDPI (192+ DPI according to GNOME), we should double all graphics and pixel calculations (so they approximate the same physical size as on a display that is half the resolution). If we're using vector graphics, the graphics should remain crisp; otherwise we may need @2x assets or to just always use twice-as-big assets and scale them down on loDPI.