There are different examples of miracle, no miracle is too big or too small, and any miracle can be regarded as a miracle. An example of a miracle is someone that has been involved in a serious accident, and the person comes out without any scratch, and the car involved during the accident was hanging on a cliff, and the car was destroyed; this event can be regarded as a miracle.
Another example is a patient with cancer, stage four precisely and after series of test such patient have been given the number of day, weeks or years he or she has to live, and such a patient lives longer than that, and all the dead cells of Cancer are also gone, this can be regarded as a miracle. Lastly, there are many other miracles like waking up in the morning, when someone's life support is removed, and the person still survives it.