html{
    background-color: #CFC;
    font-family: Georgia, Cambria, serif;
    font-size: 16px;
}

*{
    color: #00F;
}

h1.titulo_n1{
    color: red;
    font-family: Verdana, Calibri, sans-serif;
    font-size: 32px;
}

h2{
    color: #A00;
    font-style: Verdana, Calibri, sans-serif;
    font-size: 24px;
}


span.datos_libro{
    color: #060;
}

span.texto_sustantivo{
    font-size: 20px;
    font-weight: bold;
}

span.texto_cursiva{
    color: #FFF;
    background-color: #000;
    font-style: italic;
}

.regresar{
    margin-top: 200px;
    text-align: center;
    font-size: 25px;}
    .back{
        font-family: Verdana, Geneva, Tahoma, sans-serif;
        text-decoration: none;
        color: black;}
        .back:hover{
            text-decoration: underline;
}