Hi Sophie! No, you can only have one ID on one HTML element. Since ids are unique only one is needed to uniquely identify that specific tag. If you try to add two separate id attributes to an HTML element, the browser will ignore the second added and only recognise the first id attribute in the opening tag.
One question, Did you separate the classes uppercase and big text just for the example? Or why you didn't create only one class in css like upper case big text??