* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: Arial, sans-serif;
    background-color: #f4f4f4;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

.container {
    background-color: #fff;
    padding: 20px;
    border-radius: 5px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

#to-do {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
}

#task {
    flex: 1;
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 5px;
}

#to-do #btn {
    padding: 10px 20px;
    border: none;
    background-color: #28a745;
    color: #fff;
    border-radius: 5px;
    cursor: pointer;
}

#to-do #btn:hover {
    background-color: #218838;
}

ul {
    list-style-type: none;
}

li {
    padding: 10px;
    background-color: #f9f9f9;
    border: 1px solid #ddd;
    border-radius: 5px;
    margin-bottom: 10px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

button {
    background-color: transparent;
    border: none;
    color: #dc3545;
    font-size: 16px;
    cursor: pointer;
}

button:hover {
    color: #c82333;
}