text: function biggestElement(matrix) {
  
      let biggestNum = Number.NEGATIVE_INFINITY;
  
      matrix.forEach(e => e.forEach(a => biggestNum = Math.max(biggestNum, a)));
  
      console.log(biggestNum);
  }
  
  biggestElement([[20, 50, 10], [8, 33, 145]]);
  biggestElement([[3, 5, 7, 12], [-1, 4, 33, 2], [8, 3, 0, 4]]);