Inherit tabIndex in Pre

Author: hasparus

src/components/pre/index.tsx

@@ -30,6 +30,7 @@ export function Pre({
 
   const copyButton = copy === "" && (
     <CopyToClipboard
+      tabIndex={props.tabIndex}
       className={filename ? "_ml-auto" : ""}
       getValue={() => preRef.current?.querySelector("code")?.textContent || ""}
     />