body {
    font-family: 'Arial', sans-serif;
    background-color: #f4f4f4;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
}

.app-container {
    background: white;
    padding: 25px 30px;
    border-radius: 10px;
    width: 350px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

h1 {
    text-align: center;
    margin-bottom: 20px;
}

.input-container {
    display: flex;
    gap: 5px;
}

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

button {
    padding: 10px 15px;
    border: none;
    background-color: #28a745;
    color: white;
    border-radius: 5px;
    cursor: pointer;
}

button:hover {
    background-color: #218838;
}

ul {
    list-style: none;
    padding: 0;
    margin-top: 20px;
}

li {
    padding: 10px;
    background-color: #f1f1f1;
    margin-bottom: 10px;
    border-radius: 5px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
}

li.completed {
    text-decoration: line-through;
    opacity: 0.6;
}

li button {
    background-color: #dc3545;
    padding: 5px 8px;
    border: none;
    border-radius: 5px;
    color: white;
    cursor: pointer;
}

li button:hover {
    background-color: #c82333;
}