fix key property

src/components/TextOutput.js

@@ -24,10 +24,9 @@ export const TextOutput = () => {
         const isSentenceStart = sentences.includes(wordBeginning)
 
         return (
-          <>
+          <span key={idx}>
             {isWordStart && ' '}
             <span
-              key={idx}
               className={classNames({
                 [styles.current]: isCurrent,
                 [styles.sentenceBeginning]: isSentenceStart
@@ -35,7 +34,7 @@ export const TextOutput = () => {
             >
               {segment}
             </span>
-          </>
+          </span>
         )
       })}
     </div>