Template:ContentGrid/styles.css

.tpl-contentgrid {
	margin: 1em 0;
	display: grid;
}

.tpl-contentgrid .mw-tpl-colorbox {
	margin: 0; /* in favour of grid-gap on [[Template:ContentGrid]] */
} /* From https://www.mediawiki.org/wiki/Template:ContentGrid/styles.css */