UX: use color variable for background of shortcut keys

UX: use color variable for background of shortcut keys

diff --git a/app/assets/stylesheets/common/components/keyboard_shortcuts.scss b/app/assets/stylesheets/common/components/keyboard_shortcuts.scss
index e743976..303acbd 100644
--- a/app/assets/stylesheets/common/components/keyboard_shortcuts.scss
+++ b/app/assets/stylesheets/common/components/keyboard_shortcuts.scss
@@ -51,7 +51,7 @@
     }
 
     span {
-      background: #f2f2f2;
+      background: $primary-very-low;
       border-radius: 3px;
       display: inline-flex;
       margin: 0 6px;

GitHub sha: 32e14045