Magento2 Welcome Email
No correct solution
OTHER TIPS
Extend your Magento_Sales module from Luma ( you are using ). And make changes in _module.less/_email.less as your required
From
vendor/magento/theme-frontend-luma/Magento_Sales/web/css/source/_module.less
to
app/design/frontend/vendor-name/theme-name/Magento_Sales/web/css/source/_module.less
After editing run below commands
php bin/magento setup:upgrade
php bin/magento setup:static-content:deploy
php bin/magento cache:clean
php bin/magento cache:flush
I hope this will help you out , let me know if any problem
Thanks
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