body {
  background-color: Gray;
  color: Black;
  font-family: "Comic Sans MS", sans-serif;
}

.rainbow-bg {
  background-image: linear-gradient(
    to left,
    red 0%, red 14.28%,
    orange 14.28%, orange 28.56%,
    yellow 28.56%, yellow 42.84%,
    green 42.84%, green 57.12%,
    blue 57.12%, blue 71.4%,
    indigo 71.4%, indigo 85.68%,
    violet 85.68%, violet 100%
  );
  height: 5000px;
}