Larvel dhtmlx gantt chart with smartadmin/4.5.1 theme

I am using laravel dhtmlx gantt chart into bootstrap smartadmin/4.5.1 theme, And I am facing issue in app.bundal.css when I import dhtmlx gantt chart css file in the template. When I import dhtmlx gantt chart css template is continue loading. How I can solve this problem. Laravel version: 5.8 php version: 7.2

via Chebli Mohamed