color-matrix {
  matrix: matrix3d(2, 0, 0, 0, 0, 2, 0, 0, 0, 0, 2, 0, 0, 0, 0, 100);
  child: radial-gradient {
    bounds: 0 0 50 50;
    center: 25 25;
    hradius: 40;
    vradius: 40;
    stops: 0 rgb(255,0,0), 1 rgba(0,255,255,0);
  }
}