Colors have meaning.
You can use them to evoke a mood on your website that complements your book.
Here’s a list of common colors and the emotions they trigger in readers:
Love, passion, danger, warning, excitement, food, impulse, action, adventure.
Comfort, creativity, celebration, fun, youth, affordability.
Curiosity, playfulness, cheerfulness, amusement.
Money, nature, animals, health, healing, life, harmony.
Trustworthiness, success, seriousness, calmness, power, professionalism.
Royalty, justice, ambiguity, uncertainty, luxury, fantasy, dreams.
Innocence, purity, cleanliness, simplicity.
Softness, sweetness, innocence, youthfulness, tenderness
Earth, nature, tribal, primitive, simplicity.
Neutrality, indifference, reserved.
Timeless, darkness, seriousness, mystery, secrecy
*Colors do have different meanings in various cultures. This list largely reflect a US audience.