> ## Documentation Index > Fetch the complete documentation index at: https://www.courier.com/docs/llms.txt > Use this file to discover all available pages before exploring further. # Email Template CSS Classes > Style Courier email templates using standardized CSS class names. Target content blocks, text elements, headers, footers, and other components with custom CSS in your brand templates. Courier exposes standardized CSS classes on every email template element. Use these to customize the look and feel of your branded email notifications. ## Adding CSS to Your Brand Templates Courier email templates use inline styles by default. You can add custom CSS in the `