html, body, h1{
  margin: 0;
  padding: 0;
}

body {
  background-image: url(../images/back_2.jpg);
  background-repeat: no-repeat;
  background-position: top center;
  font-family: 'Open Sans', sans-serif, 'Helvetica', 'Arial';
}

h1 {
	font-family: 'Open Sans', sans-serif, 'Helvetica', 'Arial';
	text-shadow: 0px 0px 3px rgba(0, 0, 0, 1);
	color: #FFF;
}

.titulo {
  width: 100%;
  text-align: center;
  padding-top: 5%;
}
.contenedor {
  width: 75%;
  margin: 3% auto 0 auto;
}
.perfil-tarjeta-julian.mdl-card {
  width: 180px;
  height: 180px;
  background: url('../images/julian_paiardi.jpg') center / cover;
  float: left;
}
.perfil-tarjeta-julian > .mdl-card__actions {
  height: 46px;
  background: rgba(0, 0, 0, 0.4);
}
.perfil-tarjeta-mauricio.mdl-card {
  width: 180px;
  height: 180px;
  background: url('../images/mauricio_paiardi.jpg') center / cover;
  position: absolute;
  left: 50%;
  transform: translate(-50%);
}
.perfil-tarjeta-mauricio > .mdl-card__actions {
  height: 46px;
  background: rgba(0, 0, 0, 0.4);
}
.perfil-tarjeta-alejandro.mdl-card {
  width: 180px;
  height: 180px;
  background: url('../images/alejandro_paiardi.jpg') center / cover;
  float: right;
}
.perfil-tarjeta-alejandro > .mdl-card__actions {
  height: 46px;
  background: rgba(0, 0, 0, 0.4);
}
.perfil-tarjeta__filename {
  color: #fff;
  font-size: 14px;
  font-weight: 500;
}

.mdl-card .mdl-button {
  color: #fff;
  padding: 0 14px !important;
  width: 142px;
  border: 1px solid rgba(191, 191, 191, 0.40);
}

.mdl-card__actions {
  padding: 4px !important;
}

@media screen and (max-width: 680px) {
    .perfil-tarjeta-julian.mdl-card, .perfil-tarjeta-alejandro.mdl-card {
      float: none;
      margin: 5% auto;
    }
    .perfil-tarjeta-mauricio.mdl-card {
      float: none;
      position: relative;
    }
}