Found something! Quick and short tips on using the css auto value!
Take a look at sitepoint’s AtoZ series quick tips on various CSS values and properties. And in this article it focuses on using the “auto” value on the overflow property.
Here is Hongkiat’s tip on using the auto value specifically on margins and horizontal alignment as well.
And check this article that tackles the difference of declaring width 100% and width auto on responsive design.