Use bootstrap CDN

Helios/Views/Shared/_Layout.cshtml

Helios/wwwroot/lib/bootstrap/LICENSE

Helios/wwwroot/lib/bootstrap/dist/css/bootstrap-grid.css

Helios/wwwroot/lib/bootstrap/dist/css/bootstrap-grid.css.map

Helios/wwwroot/lib/bootstrap/dist/css/bootstrap-grid.min.css

...wwwroot/lib/bootstrap/dist/css/bootstrap-grid.min.css.map

Helios/wwwroot/lib/bootstrap/dist/css/bootstrap-grid.rtl.css

...wwwroot/lib/bootstrap/dist/css/bootstrap-grid.rtl.css.map

...wwwroot/lib/bootstrap/dist/css/bootstrap-grid.rtl.min.css

...oot/lib/bootstrap/dist/css/bootstrap-grid.rtl.min.css.map

Helios/wwwroot/lib/bootstrap/dist/css/bootstrap-reboot.css

...s/wwwroot/lib/bootstrap/dist/css/bootstrap-reboot.css.map

...s/wwwroot/lib/bootstrap/dist/css/bootstrap-reboot.min.css

...wroot/lib/bootstrap/dist/css/bootstrap-reboot.min.css.map

...s/wwwroot/lib/bootstrap/dist/css/bootstrap-reboot.rtl.css

...wroot/lib/bootstrap/dist/css/bootstrap-reboot.rtl.css.map

...wroot/lib/bootstrap/dist/css/bootstrap-reboot.rtl.min.css

...t/lib/bootstrap/dist/css/bootstrap-reboot.rtl.min.css.map

...os/wwwroot/lib/bootstrap/dist/css/bootstrap-utilities.css

...wwroot/lib/bootstrap/dist/css/bootstrap-utilities.css.map