.contenedor {
  margin-bottom: 40px;
  display: grid;
  grid-template-columns: repeat(3, 320px);
  grid-template-rows: repeat(3, auto);
  gap: 5px;
  justify-content: center;
  align-items: center;
}
#descripcion {
  margin-top: 100px;
  margin-bottom: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  height: 40px;
}
main a {
  height: 250px;
  width: 320px;
}
.galeria {
  object-fit: cover;
  height: 250px;
  width: 320px;
  background-color: gray;
}
.galeria:hover {
  filter: grayscale(100%);
}

@media screen and (max-width: 600px) {
  #descripcion {
    font-size: 0.8rem;
  }
  .contenedor {
    grid-template-columns: repeat(1, minmax(0, 1fr));
    justify-items: center;
    align-items: center;
  }
}

@media (min-width: 601px) and (max-width: 900px) {
  .contenedor {
    grid-template-columns: repeat(2, 280px);
    grid-template-rows: repeat(5, 230);
    gap: 5px;
  }
  main a {
    height: 230px;
    width: 280px;
  }
  .galeria {
    height: 230px;
    width: 280px;
    background-color: gray;
  }
}
@media (min-width: 900px) and (max-width: 970px) {
  .contenedor {
    grid-template-columns: repeat(3, 300px);
    grid-template-rows: repeat(5, auto);
    gap: 5px;
  }
  main a {
    height: 230px;
    width: 280px;
  }
  .galeria {
    height: 230px;
    width: 300px;
  }
}