A clean mobile banner should be simple and easy to understand at a glance. Since the phone screen is small, it is better to use short text and one main image instead of many. The message should focus on one idea, like a sale or a new product. Using enough empty space around the text makes it look neat and not jammed. The color should match the brand, but it should not be too bright or too dark. Fonts should be bold enough to read easily without looking heavy. What design elements do you think make a banner look simple and still catch attention?