Merge branch 'fe-update-common-styles' into 'master'

Replace h-13em with h-12em

See merge request gitlab-org/gitlab-ce!24895

app/assets/stylesheets/framework/common.scss

@@ -390,9 +390,12 @@ img.emoji {
 
 /** COMMON SIZING CLASSES **/
 .w-0 { width: 0; }
-.h-13em { height: 13em; }
+
+.h-12em { height: 12em; }
+
 .mw-460 { max-width: 460px; }
 .mw-6em { max-width: 6em; }
+
 .min-height-0 { min-height: 0; }
 
 /** COMMON SPACING CLASSES **/