userscript...

src/views/Action/index.js

@@ -0,0 +1,16 @@
+import Box from "@mui/material/Box";
+import Fab from "@mui/material/Fab";
+import AddIcon from "@mui/icons-material/Add";
+import ThemeProvider from "../../hooks/Theme";
+
+export default function Action() {
+  return (
+    <ThemeProvider>
+      <Box style={{ position: "fixed", top: 16, right: 16, zIndex: 10001 }}>
+        <Fab color="primary">
+          <AddIcon />
+        </Fab>
+      </Box>
+    </ThemeProvider>
+  );
+}