#reader-container {
    position: relative;
    width: 100%;
    height: 80vh;
    margin: 20px 0;
}

#progress-bar {
    width: 100%;
    height: 5px;
    background-color: #ccc;
}

#book-reader {
    width: 100%;
    height: 100%;
}

.modo-escuro {
    background-color: #222;
    color: #fff;
}

.fonte-maior {
    font-size: 1.2em;
}

.contraste-alto {
    background-color: #000;
    color: #ff0;
}