css

border: 1px solid blue

Good default font: font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";

events for drag & drop

dragstart
dragenter
dragleave
dragover
drop

must event.preventDefault() on those

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