* {
  color: gray;
  background-color: lightgray;
}

#main-title {
  color: darkred;
  background-color: mistyrose;
}

.nav-link {
  color: forestgreen;
  background-color: lightyellow;
}

.color-box p {
  color: saddlebrown;
  background-color: lemonchiffon;
}

.color-box > p {
  color: goldenrod;
  background: ivory;
}