Just a recommendation since in general I think your project is well done.
Add to the name of the NFT and the creator the property transition: color 400ms (the first value is the property to apply the transition and the second is the delay) this to generate a color change with a slight transition so that the change is not so abrupt, this will allow you to make nice animation later.
I would also recommend you to learn BEM methodology, which is a methodology for naming your classes, that will help you to have it more organized, the same level of specificity in your style sheets and helps teamwork when handling a methodology like this. Also you could learn about Reset CSS and Normalize CSS which are stylesheets to reset the style for all browsers and not have to use the * in your stylesheet to reset the values.
I hope my comments are helpful.