Change to relative file paths

src/assets/styles/index.scss

@@ -1,6 +1,6 @@
 @import 'spec/settings/index';
 @import 'spec/tools/index';
-@import "~bootstrap/scss/bootstrap";
+@import "../../../node_modules/bootstrap/scss/bootstrap";
 @import 'spec/index';
 @import 'vendor/index';
 

src/assets/styles/vendor/index.scss

@@ -1,4 +1,4 @@
-@import '~perfect-scrollbar/css/perfect-scrollbar';
+@import '../../perfect-scrollbar/css/perfect-scrollbar.css';
 @import 'themify-icons';
 @import 'font-awesome';
 @import 'perfectScrollbar';