themes-wordpress/seedlet/assets/sass/blocks/columns/_style.scss

.wp-block-columns {

	.wp-block-column {
		& > * {
			margin-top: calc(0.66 * var(--global--spacing-vertical));
			margin-bottom: calc(0.66 * var(--global--spacing-vertical));

			@include media(mobile) {
				margin-top: var(--global--spacing-vertical);
				margin-bottom: var(--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: calc(0.66 * var(--global--spacing-vertical));

		@include media(mobile) {
			margin-bottom: var(--global--spacing-vertical);
		}

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

	/**
	 * Block Options
	 */
	&.alignfull {
		padding-left: var(--global--spacing-unit);
		padding-right: var(--global--spacing-unit);
	}
}