Use monospace font for commit sha.

app/views/projects/commit/_commit_box.html.haml

@@ -19,7 +19,7 @@
 %p
   %span.light Commit
-  = link_to @commit.id, namespace_project_commit_path(@project.namespace, @project, @commit)
+  = link_to @commit.id, namespace_project_commit_path(@project.namespace, @project, @commit), class: "monospace"
 .commit-info-row
   %span.light Authored by
   %strong
@@ -36,7 +36,7 @@
 .commit-info-row
   %span.cgray= pluralize(@commit.parents.count, "parent")
   - @commit.parents.each do |parent|
-    = link_to parent.short_id, namespace_project_commit_path(@project.namespace, @project, parent)
+    = link_to parent.short_id, namespace_project_commit_path(@project.namespace, @project, parent), class: "monospace"
 - if @ci_commit
   .pull-right