A good contrast between the text and the wallpaper is critical to successful banner ads. A lack of contrast between the text and the background can make it difficult to read. Black text on a white wallpaper is the highest contrast, but it is also the most difficult to read. A light-colored backdrop with light-colored texts is less readable and can lead to eye fatigue. If you want to include bold text in your banner, you should use a light-colored Image for it.