Mars has been seen as the brightest over the decades. Mars and the Sun were directly opposite to each other. The earth was in the middle of these two.
But on Sunday night the Mars come to the closest point to Earth. So it appeared clear bigger and brighter in the night sky of Sunday.
Who was standing towards the sky at night, watched a dot in the sky of night. Moreover if you have a telescope you can watch the part of Mars as bigger.
An expert says it would be appeared in the sky of night for about another month.