The brightness or whiteness of a screen can impact how easy it is to experience content including text. Many devices, including student Chromebooks, have a setting which allows for automatically adjusting colors based on different factors, including time of day.

• 1. How To Use The Night Light Feature of ChromeOS 
  2. How To Adjust Color and Text Display in iOS
  3. How to Adjust Color Display in Android
     

     
     Night Light feature in ChromeOS