Hi Dear @beatrizgonzalezalo,
Thank you for the topic.
I am really sorry about the issue you are experiencing. But, most probably, there is a conflict with the theme you are using.
Can you please send us the link where the given quiz/shortcode is located? We will provide you a custom CSS.
If it is considered as personal or sensitive information to be posted, please contact us via the following contact form.
Thank you.
Hi!
I rebooted everything and then created the question again and it worked.
Thank you for your help!