WC-Coupon-Manager-Plugin/coupon-manager/public/css/coupon-manager-public.css

/**
 * All of the CSS for your public-facing functionality should be
 * included in this file.
 */

.copy_text_btn_sm{
		padding: 10px 15px;
    	border-radius: 2px;
	}
	.copy_text_btn_md{
		padding: 10px 25px;
    	border-radius: 2px;
	}
	.copy_text_btn_lg{
		padding: 10px 40px;
    	border-radius: 2px;
	}