themes-wordpress/varia/sass/blocks/columns/_style.scss

.wp-block-columns {

	.wp-block-column {
		& > * {
			margin-top: #{ 0.666 * map-deep-get($config-global, "spacing", "vertical") };
			margin-bottom: #{ 0.666 * map-deep-get($config-global, "spacing", "vertical") };

			@include media(mobile) {
				margin-top: map-deep-get($config-global, "spacing", "vertical");
				margin-bottom: map-deep-get($config-global, "spacing", "vertical");
			}

			&:first-child {
				margin-top: 0;
			}

			&:last-child {
				margin-bottom: 0;
			}
		}

		&:last-child {
			margin-bottom: 0;
		}
	}

	.wp-block-column:not(:last-child) {
		margin-bottom: #{ 0.666 * map-deep-get($config-global, "spacing", "vertical") };

		@include media(mobile) {
			margin-bottom: map-deep-get($config-global, "spacing", "vertical");
		}

		@include media(laptop) {
			/* Resetting margins to match _block-container.scss */
			margin-bottom: 0;
		}
	}

	/**
	 * Block Options
	 */
	&.alignfull {
		padding-left: #{map-deep-get($config-global, "spacing", "horizontal")};
		padding-right: #{map-deep-get($config-global, "spacing", "horizontal")};

		&:not(:first-child) {
			margin-top: map-deep-get($config-global, "spacing", "vertical");
		}

		&:not(:last-child) {
			margin-bottom: map-deep-get($config-global, "spacing", "vertical");
		}
	}
}