body {
  font-family: Arial, sans-serif;
  background: #f4f4f4;
  text-align: center;
  padding: 20px;
}
.container {
  max-width: 800px;
  margin: auto;
}
button {
  padding: 10px 20px;
  font-size: 16px;
  margin: 20px 0;
  cursor: pointer;
}
.palette {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 10px;
}
.color-box {
  width: 120px;
  height: 120px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  color: #fff;
  border-radius: 8px;
  box-shadow: 0 0 5px rgba(0,0,0,0.2);
}