How to add a transparent text box

Hello, how can I add a floating transparent text box on my main page? Is there a plugin or something for that?
thanks

Dear Marta,

Thank you for asking. Try one of the following plugins:

To make its background a bit transparent, you would apply custom CSS code which looks like the following:

.selector{
  background-color: rgba(0,0,0,0.4) !important;
}

Regards,
Kharis