themes-wordpress/seedlet/assets/sass/elements/_media.scss

/* Media captions */
figcaption,
.wp-caption,
.wp-caption-text {
	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;

	.alignleft &,
	.alignright & {
		margin-bottom: 0;
	}
}

/* WP Smiley */
.page-content .wp-smiley,
.entry-content .wp-smiley,
.comment-content .wp-smiley {
	border: none;
	margin-bottom: 0;
	margin-top: 0;
	padding: 0;
}

/* Make sure embeds and iframes fit their containers. */
embed,
iframe,
object {
	max-width: 100%;
}