:root {
  --w: 212px;
  --h: 212px;
  --sizeImg: 212px;
}

body {
  flex: 1;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  background-image: url(../../img/portada/fondoPortadaLibre.jpg);
  background-repeat: repeat;
  background-size: contain;
  background-position: center center;
  text-align: center;
  font-family: calibri;
}

.tarjeta {
  position: relative;
  transform-style: preserve-3d;
  animation: iniciar 10s;
}

@media only screen and (max-width: 1024px) {
  :root {
    --w: 150px;
    --h: 150px;
    --sizeImg: 150px;
  }
  body {
    background-color: red;
  }
}

@media only screen and (max-width: 480px) {
  :root {
    --w: 110px;
    --h: 110px;
    --sizeImg: 110px;
  }
  body {
    background-color: black;
  }
}