@supports(display: grid ) {
  .grid-contenedor-panel-materias-letra-integrado {
    display: grid;
    grid-template-columns: 1fr;
    grid-gap: 20px;
    grid-auto-flow: row;
  }

  @media screen and (min-width: 768px) {
    .grid-contenedor-panel-materias-letra-integrado {
      grid-gap: 30px;
    }
  }

  @media screen and (min-width: 1200px) { 
    .grid-contenedor-panel-materias-letra-integrado {
      grid-template-columns: 1140px;
    }
  }
}