You can modify the Code Information Indicators styles from the Options dialog windows. This will help you to customize the appearance of indicator text. You can go to Tools –> Options –> Environment -> Fonts and Colors and then from Show Settings For dropdown, select Code Information Indicators . On the other hand, you can use Search within Options Dialog Control – Visual Studio 2013 to search this options.
From the “Code Information Indicator” settings, you can change the font and text color for the respective options. You can also customize the styles for pop up windows. As shown in the following images, the code information indicators are customize and applied for different themes.