WordPress.org

Ok, i installed your plugin with the twentytwelve theme and saw that when viewing it in a mobile resolution the columns skews accordingly and honestly this is not the expected behaviour (IMHO) so i found a solution, may be a not-so-clean one but it works pretty well.

For having the columns stacked when you are on mobile simply add these lines on the shortcodes.css file after line 90 and before /* Media */ :

* STACKABLE COLUMNS FOR TWENTY TWELVE */

@media only screen and (max-width:481px) {

body .simnor-shortcode-cols {
	display: block;
	overflow: hidden;
	clear: both;
	margin: 0 0 20px 0;
}
	body .simnor-shortcode-col {
		float: left;
		display: block;
	}
		body .simnor-shortcode-col-inner {
			margin: 0 15px 0 0;
		}

	body .simnor-shortcode-cols-half-half .simnor-shortcode-col-a,
	body .simnor-shortcode-cols-half-half .simnor-shortcode-col-b { width: 100%; }

	body .simnor-shortcode-cols-third-third-third .simnor-shortcode-col-a,
	body .simnor-shortcode-cols-third-third-third .simnor-shortcode-col-b,
	body .simnor-shortcode-cols-third-third-third .simnor-shortcode-col-c { width: 100%; }

	body .simnor-shortcode-cols-twothirds-third .simnor-shortcode-col-a { width: 100%; }
	body .simnor-shortcode-cols-twothirds-third .simnor-shortcode-col-b { width: 100%; }

	body .simnor-shortcode-cols-third-twothirds .simnor-shortcode-col-a { width: 100%; }
	body .simnor-shortcode-cols-third-twothirds .simnor-shortcode-col-b { width: 100%; }

	body .simnor-shortcode-cols-quarter-quarter-quarter-quarter .simnor-shortcode-col-a,
	body .simnor-shortcode-cols-quarter-quarter-quarter-quarter .simnor-shortcode-col-b,
	body .simnor-shortcode-cols-quarter-quarter-quarter-quarter .simnor-shortcode-col-c,
	body .simnor-shortcode-cols-quarter-quarter-quarter-quarter .simnor-shortcode-col-d { width: 100%; }

	body .simnor-shortcode-cols-half-quarter-quarter .simnor-shortcode-col-a { width: 100%; }
	body .simnor-shortcode-cols-half-quarter-quarter .simnor-shortcode-col-b,
	body .simnor-shortcode-cols-half-quarter-quarter .simnor-shortcode-col-c { width: 100%; }

	body .simnor-shortcode-cols-quarter-quarter-half .simnor-shortcode-col-a,
	body .simnor-shortcode-cols-quarter-quarter-half .simnor-shortcode-col-b { width: 100%; }
	body .simnor-shortcode-cols-quarter-quarter-half .simnor-shortcode-col-c { width: 100%; }

	body .simnor-shortcode-cols-quarter-half-quarter .simnor-shortcode-col-a,
	body .simnor-shortcode-cols-quarter-half-quarter .simnor-shortcode-col-c { width: 100%; }
	body .simnor-shortcode-cols-quarter-half-quarter .simnor-shortcode-col-b { width: 100%; }

}