body {
    font-family: Arial, sans-serif;
    background-color: #f4f4f4;
    margin: 0;
    padding: 0;
}

.container {
    max-width: 600px;
    margin: 0 auto;
    padding: 20px;
    background-color: white;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

h1, h2 {
    color: #333;
}

form {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
}

input, button {
    padding: 10px;
    font-size: 16px;
}

button {
    background-color: #28a745;
    color: white;
    border: none;
    cursor: pointer;
}

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

.list {
    list-style-type: none;
    padding: 0;
}

.list li {
    padding: 10px;
    background-color: #fff;
    border: 1px solid #ddd;
    margin-bottom: 5px;
    display: flex;
    justify-content: space-between;
}

.list li.dragging {
    background-color: #e2e6ea;
}

.list li.completed {
    color: #999;
    text-decoration: line-through;
}