How to change a checkout field (its length/width) or an image on the checkout page?

How to change a checkout field (its length/width) or an image on the checkout page?

Out of the box, the One Step Checkout extension allows you to modify the checkout field width parameters in System → Manage Checkout Fields: 



If you need to make additional adjustments to the checkout design, you may do it by modifying the checkout styles. Styles are configured through CMS blocks in the admin panel. To change field parameters, you need to create a new block in Content → Blocks → Add New Block:


     
On the block configuration page, you may add the required parameters with the Page Builder option: 



Once you make the required style modifications and save the block, please, navigate to Amasty → One Step Checkout → Configuration → Optional UI Elements and insert the newly created block into checkout blocks.



Once you have completed the modifications, you will be able to see the changes reflected on the storefront.