Extra gray horizontal line under sub tabs : https://v5-archive.patternfly.org/components/tabs/react-demos/#ws-page-title

In the new Content > Container Images page, The active and inactive indicators on subtabs - when hovering over Synced images tab text and Bootable images tab text should align exactly with the horizontal line under it. Refer to image attachment and notice the gap between the blue highlight and horizontal line below. That gap needs to be removed.