Fix site not getting module css due to missing file styles-m + styles-l

Question:

The layout does not show the way I would like it to show (like it shows on your demo). I use Mgs theme for reference.

Answer:

Step 1: Add file: view/frontend/web/css/style.css

Step 2: Add file: view/frontend/layout/checkout_index_index.xml

Step 3: Delete folder: view/frontend/web/css/source

Note: With step 1 and 2, please find our instruction as attachments below.