I saw there is multiple instants of theme.scss in your theme and it’s not loading https://prnt.sc/QCHMkLGnB0op that’s why website is breaking
try to remove multiple instants of theme.scss from theme.lquid file or I need your store access to further investigate the issue
Editing code can be a tricky business - in the future I would highly recommend making sure you save a copy of your theme before making any kind of changes - this way, you always have something to fall back on.
The good news here is that we do have a feature that means you can roll back your theme to a time before you made the changes that “broke” your store. Here are the steps to access this:
From your Shopify admin, go to Online Store > Themes.
Find the theme you want to edit, click the … button to open the actions menu, and then click Edit code.
Under the Templates header, click into one of the .liquid files you have edited recently.
Click Older versions next to the .liquid file name.
Click the drop-down menu to select an older version. Clicking a datestamp will roll the code back to that saved version.
Click Preview and see if the error was fixed.
Save your changes
This should leave you with the version of the theme you had before the mistake was added. I trust this advice helps! I want to let you know I tried accessing your store and when I go to http://shajahanstore.com/ I cannot access your storefront. I see the following error:
Once you have done this, please be aware it takes up to 48 hours for these changes to apply. It can be a good idea to use your .myshopify.com domain in the meantime while this custom domain is out of action.