transparent no color?

Does the validator think that transparent is no color? Is that right or am I
wrong?

Line : 65 (Level : 1) You have no background-color with your color : h1.top

h1.top {
  position: absolute;
  left: 50px;
  top: 12px;
  color: rgb(192, 192, 192);
  background-color: transparent;
}

               Alex