body{font-family:Arial,sans-serif;max-width:500px;margin:0 auto;padding:20px;background-color:#f4f4f4}.todo-container{background-color:#fff;border-radius:8px;box-shadow:0 2px 4px #0000001a;padding:20px}.todo-input{display:flex;margin-bottom:20px}.todo-input input{flex-grow:1;padding:10px;font-size:16px;border:1px solid #ddd;border-radius:4px;margin-right:10px}.todo-input button{padding:10px 15px;background-color:#4caf50;color:#fff;border:none;border-radius:4px;cursor:pointer}.todo-list{list-style-type:none;padding:0}.todo-item{display:flex;justify-content:space-between;align-items:center;padding:10px;border-bottom:1px solid #eee}.todo-item.completed{text-decoration:line-through;color:#888}.todo-item button{background-color:#f44336;color:#fff;border:none;padding:5px 10px;border-radius:4px;cursor:pointer}