Change:
#scroll-to-top span.icon::before { content: ""; display: block; <del> background: var(--vscode-button-foreground); </del> <ins> background: var(--vscode-button-secondaryForeground); </ins> /* Chevron up icon */ webkit-mask-image: url('data:image/svg+xml;base64,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'); -webkit-mask-image: url('data:image/svg+xml;base64,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');

Discussion:
<!-- Do Not Delete This! bugreporttemplate --<!-- Please read our Rules of Conduct: --<!-- Read our guide about submitting issues: --<!-- Search existing issues to avoid creating duplicates. --<!-- Test using the latest Insiders build to see if your issue has already been fixed: --<!-- Instead of creating your report here, use 'Report Issue' from the 'Help' menu in VS Code to pre-fill useful information. --<!-- Launch with to check. --Does this issue occur when all extensions are disabled?: Yes <!-- If you answered No above, use 'Help: Start Extension Bisect' from Command Palette to try to identify the cause. --<!-- Issues caused by an extension need to be reported directly to the extension publisher. The 'Help Report Issue' dialog can assist with this. --- VS Code Version: 1.81.1 OS Version: macOS 13.5.1 Steps to Reproduce: to a theme that uses similar primary button background and secondary button foreground colours (I've used Bikkuri in the screenshots) that the scroll to top button icon in the Extensions view has low contrast due to the mixing of primary and secondary button variables Primary and secondary buttons in a theme where primary and secondary buttons have similar background and foreground colours: <img width="255" alt="Screenshot 2023-08-22 at 23 27 07" src=""Leading to a scroll to top button looking like this: <img width="75" alt="Screenshot 2023-08-22 at 23 27 33" src=""
Can you please take extension page specific issues with webview. I can look into general webview problems but this issue is with the css for the markdown on the extension page
Sure. I assumed this is a general webview issue.