body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 0;
    color: #333;
    background-color: #f4f4f4;
}

table {
    width: 90%;
    /* margin: 20px auto; */
    border-collapse: collapse;
}

th, td {
    border: 1px solid #ccc;
    padding: 10px;
    text-align: left;
}

.content {
    margin-left: 80px
}

th {
    background-color: #4CAF50;
    color: white;
}

button {
    background-color: #4CAF50;
    color: white;
    border: none;
    padding: 10px 20px;
    text-align: center;
    text-decoration: none;
    display: inline-block;
    font-size: 16px;
    margin: 4px 2px;
    cursor: pointer;
}

button:hover {
    background-color: #45a049;
}

a, a:visited {
    color: #06c;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

.header {
    background-color: #333;
    color: #fff;
    text-align: center;
    padding: 10px;
}

.book-list {
    max-height: 200px;
    overflow-y: auto;
    border: 1px solid #ccc;
    margin-top: 10px;
}

.book-item {
    padding: 8px;
    cursor: pointer;
}

.book-item:hover {
    background-color: #f0f0f0;
}