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

.wp-block-image {
	text-align: center;

	figcaption {
		color: var(--global--color-foreground-low-contrast);
		font-size: var(--global--font-size-xs);
		line-height: var(--global--line-height-body);
		margin-top: calc(0.5 * var(--global--spacing-unit));
		margin-bottom: var(--global--spacing-unit);
		text-align: center;
	}

	.alignright {
		margin-left: var(--global--spacing-horizontal);
	}

	.alignleft {
		margin-right: var(--global--spacing-horizontal);
	}
}

// Remove vertical margins from image block wrappers when floated
.entry-content > *[class="wp-block-image"],
.entry-content [class*="inner-container"] > *[class="wp-block-image"] {
	margin-top: 0;
	margin-bottom: 0;

	// Remove top margins from the following element when previous image block is floated
	& + * {
		margin-top: 0;
	}
}

img {
	height: auto;
	max-width: 100%;
	vertical-align: middle;
}