.imagen{
    width: 100%;
}
.imagen img{
    width: 100%;
}
.galeria{
    width: 100%;
    margin: auto;
    display: grid;
    grid-template-columns: repeat(3,1fr);
    column-gap: 1rem;
    row-gap: 1rem;
}
@media (min-width:100px){
    .galeria{
        grid-template-columns: repeat(1, 1fr);
    }
}
@media (min-width:520px){
    .galeria{
        grid-template-columns: repeat(2, 1fr);
    }
}
@media (min-width:728px){
    .galeria{
        grid-template-columns: repeat(3, 1fr);
    }
}
@media (min-width:1024px){
    .galeria{
        grid-template-columns: repeat(4, 1fr);
    }
}

img {
  width: 100%;
  height: auto;
}
@media (min-width: 768px) {
  img {
    width: 75%;  /* Images occupy 50% of their container on larger screens */
  }
}