.container{text-align:center;margin-top:50px;font-family:Arial}input{margin:5px;padding:5px}button{cursor:pointer;margin:5px;padding:5px 10px}ul{padding:0;list-style:none}li{margin:10px}.complete{color:#fff;background-color:green;border:none}.delete{color:#fff;background-color:red;border:none}.done{color:gray;text-decoration:line-through}