Copied all potty chart code without changes.

src/theme/layout/BackToTopButton.tsx

@@ -0,0 +1,32 @@
+import React, { FC } from "react";
+import { Button, Flex, Link } from "@chakra-ui/react";
+import { Icon } from "@iconify/react";
+
+interface BackToTopButtonProps {
+  show: boolean;
+}
+
+const BackToTopButton: FC<BackToTopButtonProps> = ({
+  show
+}: BackToTopButtonProps) => {
+  return (
+    <Flex
+      display={show ? "flex" : "none"}
+      pos="fixed"
+      top="85vh"
+      right={{
+        base: "1.25rem",
+        sm: "2rem",
+        md: "3rem"
+      }}
+    >
+      <Link href="/#top">
+        <Button variant="backToTop">
+          <Icon icon="akar-icons:chevron-up" />
+        </Button>
+      </Link>
+    </Flex>
+  );
+};
+
+export default BackToTopButton;