body{font-family:Arial,sans-serif;background:#eef7ff;text-align:center}.container{max-width:900px;margin:auto;padding:20px}.card{background:#fff;padding:20px;margin:15px;border-radius:12px;box-shadow:0 2px 8px rgba(0,0,0,.1)}#alphabet,#number{font-size:60px;font-weight:bold}#colorBox{width:120px;height:120px;margin:10px auto;border-radius:10px;background:red}button{padding:10px 16px;cursor:pointer}