Fix jqwidets style import.

src/main.scss

@@ -4,7 +4,7 @@ $fa-font-path: '~font-awesome/fonts';
 
 @import '~bootstrap/scss/bootstrap';
 
-@import '~jqwidgets-scripts/jqwidgets/styles/jqx.classic.css';
+@import '~jqwidgets-scripts/jqwidgets/styles/jqx.base';
 
 @import '~ngx-toastr/toastr';