.color {
  border: solid 1px black;
  display: inline-block;
  height: 40px;
  width: 40px;
}

.black {
  background-color: black;
}

.red {
  background-color: red;
}

.green {
  background-color: green;
}

.blue {
  background-color: blue;
}

.pixel {
  background-color: white;
  border: solid 1px black;
  display: inline-block;
  height: 40px;
  width: 40px;
}