*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'lato', sans-serif;
}

body {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    text-align: center;
    background: url(imagenes/biblioteca.jpg) no-repeat center center/cover;
}

.contenido-centrado {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
}

.contenedor {
    width: 80vh;
    max-width: 600px;
    min-height: 350px;
    padding: 20px;
    background-color:  rgba(202, 201, 201, 0.691);
    border: 5px solid black;
    border-radius: 30px;
}

.contenedor-interno {
    width: 80%;
}

#titulo {
    width: 100%;
    font-weight: bold;
    text-align: center;
    font-family: 'Courgette', cursive;
}

#cita {
    font-size: 27px;
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    margin: 10px;
}

#autor {
    width: 100%;
    font-size: 25px;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 20px;
    font-family: 'Courgette', cursive;
}

#boton-cambiar-cita {
    width: 180px;
    height: 50px;
    font-size: 20px;
}

button:hover {
    box-shadow: 10px 10px 30px 5px rgba(0,0,0,0.65);
    -webkit-box-shadow: 10px 10px 30px 5px rgba(0,0,0,0.65);
    -moz-box-shadow: 10px 10px 30px 5px rgba(0,0,0,0.65);
    transition: 0.6s;
}

.footer {
    position: fixed;
    bottom: 0;
    width: 100%;
    background-color:  rgba(202, 201, 201, 0.691);
    color: black;
    text-align: center;
    padding: 15px;
    font-family: 'Lato', sans-serif;
}