body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 20px;
    background-color: #f4f4f4;
    color: #333;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    min-height: 100vh;
}

.container {
    background-color: #fff;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    width: 100%;
    max-width: 500px;
}

h1 {
    color: #0056b3;
    text-align: center;
    margin-bottom: 25px;
}

.add-item {
    display: flex;
    margin-bottom: 20px;
}

.add-item input[type="text"] {
    flex-grow: 1;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px 0 0 4px;
    font-size: 16px;
}

.add-item button {
    padding: 10px 15px;
    background-color: #007bff;
    color: white;
    border: none;
    border-radius: 0 4px 4px 0;
    cursor: pointer;
    font-size: 16px;
    transition: background-color 0.2s ease;
}

.add-item button:hover {
    background-color: #0056b3;
}

#itemsList {
    list-style: none;
    padding: 0;
    margin: 0;
}

#itemsList li {
    background-color: #e9ecef;
    padding: 12px 15px;
    margin-bottom: 8px;
    border-radius: 4px;
    border: 1px solid #dee2e6;
    font-size: 16px;
    color: #495057;
}

#itemsList li:last-child {
    margin-bottom: 0;
}