* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html,
body {
    width: 100%;
    background: #efefef;
    font-family: "Franklin Gothic Book", Arial, Helvetica, sans-serif;
}

/* CONTENEDOR PRINCIPAL */

.contenedor {
    width: 100%;
    max-width: 2160px;
    margin: 0 auto;
    position: relative;
}

/* IMAGEN PRINCIPAL */

.imagen-principal {
    width: 100%;
    display: block;
}

/* BOTÓN VOLVER */

.menulink {
    width: 48px;
    position: fixed;
    top: 0px;
    right: 0;
    text-align: center;
}

.menulink {
    top: 42%;
    height: 20px;
    margin-top: -100px;
}

.menulink a,
.menulink a:hover,
.menulink a:visited,
.menulink a:active {
    font: 2vw "Franklin Gothic Book", Arial, Helvetica, sans-serif;
    color: #000;
}

.menulink img {
    width: 36px;
}

* {
    box-sizing: border-box;
}

.social {
    width: 48px;
    position: fixed;
    top: 50px;
    left: 0;
    margin-left: 2px;
}

.social {
    top: 50%;
    height: 205px;
    margin-top: -100px;
}

.social img {
    width: 30px;
}

/* RESPONSIVE */

@media (max-width:900px) {

    .btn span {
        font-size: 2vw;
    }

}

@media (max-width:600px) {

    .btn span {
        font-size: 3.0vw;
        font-weight: 900;
    }

}