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In Checkout & Registration Manager, you can customize the visual design of your checkout pages using CSS. With CSS, you reference all of the attributes of an element in an external file (though you can add inline style information in certain editable areas, as well) to separate the visual presentation of your website from the content. By doing so, you can rapidly change the look of your website.
Warning: Use caution when making changes to the values in the CSS file, especially for adjusting padding or margins or changing the position of items. These values have been determined to work for your store. We recommend that you change these attributes only if you have an advanced knowledge of CSS.
To get started, you'll need to download the default checkout CSS file. If you've modified global style settings (such as font styles, section headers, or border styles), your default checkout CSS file will reflect those attributes.
Tip: If you know the color values and fonts you want to use, select Configurable Styles, and then make all changes to these items in Checkout & Registration Manager. You can then download your modified CSS file that will already contain your color values for any additional modifications you want to make.
After you've modified your CSS file, you can upload it to Checkout & Registration Manager. If you upload the file without changing its name, Checkout & Registration Manager will append a number to the file name (for example, 1124085073___custom.css).