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

.container {
    width: 80%;
    margin: 20px auto;
}

header {
    background-color: #007bff;
    color: white;
    padding: 5px;
    text-align: center;
    font-size: 1em;
}

h2 {
    color: #333;
    margin-top: 20px;
}

form, #incompleteBookList, #completeBookList{
    background: white;
    padding: 15px;
    margin: 10px auto;
    width: 50%;
    border-radius: 15px;
    box-shadow: 5px 5px 5px rgba(0, 0, 0, 0.1);
    text-align: left;
}

label {
    font-weight: bold;
    display: block;
    margin-top: 10px;
}

input[type="text"], input[type="number"] {
    width: calc(100% - 22px);
    padding: 10px;
    margin: 5px 0;
    border-radius: 5px;
    border: 1px solid #ccc;
}

.book-actions {
    display: flex;
    gap: 10px;
    justify-content: center;
    margin-top: 10px;
}

button {
    cursor: pointer;
    transition: 0.3s;
    border: none;
    padding: 10px 15px;
    border-radius: 5px;
    margin: 5px;
    font-size: 0.9em;
}

button:hover {
    opacity: 0.8;
}

.book-title {
    font-size: 1.2em;
    font-weight: bold;
    margin-bottom: 10px;
}

.btn-green {
    background-color: #28a745;
    color: white;
}

.btn-red {
    background-color: #dc3545;
    color: white;
}

.btn-blue {
    background-color: #007bff;
    color: white;
}

.btn-yellow {
    background-color: #ffc107;
    color: white;
}

#incompleteBookList, #completeBookList {
    display: flex;
    flex-direction: column;
    align-items: left;
}