Issue #3211395 by Gauravmahlawat, andy-blum, aaron.ferris, Sakthivel M,...

Issue #3211395 by Gauravmahlawat, andy-blum, aaron.ferris, Sakthivel M, kiran.kadam911, mherchel, tushar_sachdeva, xjm: Comment form save button has incorrect background color and contrast ratio violation on hover

(cherry picked from commit 8c2a1247)