exam_student/uni_modules/lime-style/mixins/platform.scss

/* #ifdef APP-NVUE || APP-ANDROID || APP-IOS */
$is-app: true;
/* #endif */
/* #ifndef APP-NVUE || APP-ANDROID || APP-IOS */
$is-app: false;
/* #endif */

@mixin is-app {
	@if $is-app {
		@content;
	} 
}
@mixin not-app {
	@if not($is-app) {
		@content;
	} 
}