The guidance wizard that appears after reviewing the sections and before starting the actual translation has some significant display issues. I experienced them on the desktop (Firefox and Chrome on macOS), in both desktop mode and mobile responsive mode, and also on Chrome on Android. The gray background is in the wrong location on the first screen, and in an even more wrong location in the second screen. Here's a screenshot:
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Change 709408 had a related patch set uploaded (by Santhosh; author: Santhosh):
[mediawiki/extensions/ContentTranslation@master] SX: Fix alignment issue of quick tutorial in wider screens
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Change 709408 merged by jenkins-bot:
[mediawiki/extensions/ContentTranslation@master] SX: Fix alignment issue of quick tutorial in wider screens