body{margin:0;min-height:100vh;transition:background-color .3s ease}.container{max-width:800px;margin:0 auto;padding:2rem;text-align:center;font-family:Arial,sans-serif}h1{color:#333;margin-bottom:2rem}.color-controls{display:flex;flex-direction:column;align-items:center;gap:1rem}#colorPicker{width:100px;height:100px;padding:0;border:none;border-radius:50%;cursor:pointer}#colorValue{font-family:monospace;font-size:1.2rem;color:#666}