<p>In this Oct. 10, 2015 file photo, the sun sets behind a McDonald's restaurant in Ebensburg, Pa. A pivotal trial against McDonaldís that began this week is giving a peak into the inner workings of the maker of the Big Mac. The trial centers over whether McDonaldís exerts control over hiring and pay decisions for employees at restaurants run by its U.S. franchises. (AP Photo/Gene J. Puskar)</p>
McDonald's received backlash from customers Sunday after their app went down.
The fast food chain was giving away a free vanilla ice cream cone through the app on Sunday for National Ice Cream Day.