Sticky alert is full width on some pages
It should be the same width as the actual content container ![Screen_Shot_2019-08-20_at_6.51.09_PM](/uploads/732fe66b3e7853c89f94bfd466b5f15f/Screen_Shot_2019-08-20_at_6.51.09_PM.png) ![_](https://gitlab.com/gitlab-org/gitlab-ce/uploads/77e34c8ec6ad6eac0231607cdff18185/Screen_Shot_2019-08-26_at_11.54.57_AM.png)
issue