.flotante_twitter {
    width: 2.2em;
    background: none repeat scroll 0% 0% #FFF;
    min-height: 2.2em;
    border-radius: 4px;
    margin: -32% auto 0px;
    box-shadow: 5px 5px 30px #1D1D1D;
    padding: 1em;
    text-align: center;
    position: relative;
}

.contenedor_capa_flotante_twitter {
   left: 0;
   position: absolute;
   text-align: center;
   top: 0;
   z-index: 700;
}

.contenedor_capa_flotante_twitter .boton_enviar .servicio {
    background-repeat: no-repeat;
    float: left;
    height: 20px;
    margin-right: 3px;
    overflow: hidden;
    text-indent: -9999px;
    width: 20px;
    background: url(/ser/iconos/v1.x/v1.0/redes/ico_redes_med.png);
}

.contenedor_capa_flotante_twitter .boton_enviar.twitter .servicio {
    background-position: 0 -29px;
}