.single-modern-article>.single-post-gallery{
  width:100%;
  max-width:none;
  margin-left:0;
  margin-right:0;
}
.single-modern-content .wp-block-gallery,
.single-modern-content .blocks-gallery-grid,
.single-modern-content .gallery{
  width:100%;
  max-width:none;
  margin-left:0;
  margin-right:0;
}
@media(max-width:760px){
  .single-modern-article>.single-post-gallery{width:100%!important}
}