Example: ```py df = pl.DataFrame({"x": [0, 100], "y": [0.5, 1.2]}) op = Obsplot(format="png") op( { "marks": [Plot.dot(df, {"x": "x", "y": "y"})], "title": "Plot title", "style": {"background-color": "#005", "color": "#FF0"}, } ) ```