The buttons/tabs at the top of the series detail page are not stylistically consistent with the rest of the site - it appears styling is actually missing.
Created attachment 3916 [details] Screenshot Attaching a screenshot so you can see what I mean. This is in Firefox 54.0.1 on Fedora 25.
Regarding the navigation bar, the style guide can be found in previous design work by Belen Barros [1]. Regarding the little "arrow" seen in Firefox (FF) and some Internet Explorer (IE) versions, a fix may be the use of "-moz-appearance:none" and "::-ms-expand" pseudo-element, respectively. [1] http://belenbarrospena.github.io/patchwork-redesign/ https://github.com/belenbarrospena/patchwork-redesign/tree/master
I've submitted a patch that handles the "Revision" select element styling due to incompatibilities of Firefox and Internet Explorer browsers with the Boostrap library. The patch can be viewed at: https://lists.yoctoproject.org/pipermail/yocto/2017-September/037777.html Remaining item is to define if style guide for patchwork will be to adhere to that of freedesktop's instance or to Belen's design and implement any needed changes.
The change to add "active" styling to Series data bar can be seen at: https://lists.yoctoproject.org/pipermail/yocto/2017-September/037783.html and an implementation example at the staging instance: https://patchwork-staging.openembedded.org/series/6357/
This change is implemented in production.