p#texto_historia {
    float: left;
    font-size: 1.05em;
    text-align: justify;
    padding-left: 12vh;
    padding-right: 12vh;
    margin-top: 15%;
    padding-bottom: -5%;
}

@media only screen and (max-width: 650px), (orientation: portrait) {
    p#texto_historia {
        float: left;
        font-size: 0.9em;
        text-align: justify;
        padding-left: 5vh;
        padding-right: 5vh;
        margin-top: 2vh;
        padding-bottom: -5%;
    }

}