themes-wordpress/modern-business/sass/media/_captions.scss

.wp-caption {
	margin-bottom: calc(1.5 * #{$size__spacing-unit});

	&.aligncenter {

		@include media(tablet) {
			position: relative;
			left: calc( #{$size__site-tablet-content} / 2 );
			transform: translateX( -50% );
		}

		@include media(desktop) {
			left: calc( #{$size__site-desktop-content} / 2 );
		}
	}
}

.wp-caption img[class*="wp-image-"] {
	display: block;
	margin-left: auto;
	margin-right: auto;
}

.wp-caption-text {
	color: $color__text-light;
	font-size: $font__size-xs;
	font-family: $font__heading;
 	line-height: $font__line-height-pre;
 	margin: 0;
 	padding: ( $size__spacing-unit * .5 );
	text-align: center;
}