header {
  background-color: lightgoldenrodyellow;
  border-bottom: 30px solid orange;
}

header button {
  transition: 350ms color;
}

header button:hover,
header button.active {
  color: #fff !important ;
}

section {
  min-height: 61vh;
}

.color-card {
  height: 200px;
}