Find all references popup window is hard to see
When opening the Find All References (Shift F12 shortcut) popup it's difficult to see the limit between the popup window and the code behind it. On the screenshot below the limit is marked with the red dashed line.

I guess this is not specific to this popup. Any popup should have a different color. I suppose, a slightly brighter background would do the job. Or maybe a pure dark #000000

This is Javascript but I believe this applies to any language.
I second this. While the popup does follow Dracula's color scheme, it is incredibly hard to differentiate.
I agree about the lack of contrast. Here are the tweaks I've added to my User Settings:
"workbench.colorCustomizations": {
"[Dracula]": {
"peekView.border": "#BD93F9",
"peekViewEditor.background": "#21222C",
"peekViewResult.background": "#191A21",
"editorHoverWidget.border": "#BD93F9",
"editorHoverWidget.background": "#21222C"
}
},
https://code.visualstudio.com/docs/getstarted/theme-color-reference