body {
    font-family: Arial, sans-serif;
    background: url('BACKGROUND\ LISTA\ LIVROS.png') center/ cover;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

.container {
    width: 80%;
    max-width: 900px;
    background: rgba(249, 248, 248, 0.801);
    border-radius: 20px;
    padding: 20px;
    text-align: center;
    display: flex;
    flex-direction: column;
    width: 500px;
    height: 120px;
}

.header {
    background: #333;
    color: #fff;
    padding: 10px 20px;
    border-radius: 30px;
    display: flex;
    font-weight: bold;
    flex-direction: column;
    align-items: center;
    margin-bottom: 20px;
}

header {
    padding: 1rem;
    position: fixed;
    width: 85%;
    top: 0%;
}

.menu-btn {
    background-color: rgba(0, 0, 0, 0.699);
    color: white;
    border: none;
    padding: 10px 20px;
    cursor: pointer;
    border-radius: 5px;
}

.menu-btn a {
    color: white;
    text-decoration: none;
}

.exibir {
    color: white;
    background-color: #333;
}