.background-size-4 {
  background-size: 4rem 4rem;
}

/* Smooth transition for paper taking out */
#chroma-paper {
  transition: bottom 0.6s cubic-bezier(0.175, 0.885, 0.32, 1.275), transform 0.6s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}