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<!-- Thank you for your contribution! Please review https://microsoft.github.io/autogen/docs/Contribute before opening a pull request. --> <!-- Please add a reviewer to the assignee section when you create a PR. If you don't have the access to it, we will shortly find a reviewer and assign them to your PR. --> ## Why are these changes needed? Fixes `(14) Ensures the contrast between foreground and background colors meets WCAG 2 AA minimum contrast ratio thresholds` Note: the color values don't output at the exact values on the stylesheet. For example, the value `#1774E5` evaluates to `#2274E0` by the Accessibility Insights app. ## Related issue number https://github.com/microsoft/autogen/issues/5633 ## Checks - [ ] I've included any doc changes needed for <https://microsoft.github.io/autogen/>. See <https://github.com/microsoft/autogen/blob/main/CONTRIBUTING.md> to build and test documentation locally. - [ ] I've added tests (if relevant) corresponding to the changes introduced in this PR. - [ ] I've made sure all auto checks have passed.