For context, you should think of Romanticism as a broad movement spanning literature, art, music etc., and then consider how this particular novel fits into the overall cultural picture of the late eighteenth and early nineteenth centuries. Take a look at the first Encyclopedia article that I have linked. The photo on the homepage can give you an idea of what Romanticism feels and looks like: an isolated man on top of a mountain looking out at a desolate landscape, painted in dark tones.
Now, for some romantic elements in Wuthering Heights:
Emily Brontë's depiction of the moors is quintessential Romanticism. Nature plays a huge role in this literary movement, and many if not all of the characters in the novel have a relationship with the desolate yet beautiful landscape. Take a look at the imagery in the following quotation which describes the way two different characters engage with the moors.
He said the pleasantest manner of spending a hot July day was lying from morning till...
(The entire section contains 2 answers and 679 words.)