removes old css class from everywhere

app/assets/stylesheets/framework/buttons.scss

@@ -330,10 +330,6 @@
   }
 }
-.btn-file-option {
-  background: linear-gradient(180deg, $white-light 25%, $gray-light 100%);
-}
-
 .btn-build {
   margin-left: 10px;

app/helpers/blob_helper.rb

@@ -21,7 +21,7 @@ module BlobHelper
                                      options[:link_opts])
     if !on_top_of_branch?(project, ref)
-      button_tag "Edit", class: "btn disabled has-tooltip btn-file-option", title: "You can only edit files when you are on a branch", data: { container: 'body' }
+      button_tag "Edit", class: "btn disabled has-tooltip", title: "You can only edit files when you are on a branch", data: { container: 'body' }
     elsif can_edit_blob?(blob, project, ref)
       link_to "Edit", edit_path, class: 'btn btn-sm'
     elsif can?(current_user, :fork_project, project)
@@ -32,7 +32,7 @@ module BlobHelper
       }
       fork_path = namespace_project_forks_path(project.namespace, project, namespace_key: current_user.namespace.id, continue: continue_params)
-      link_to "Edit", fork_path, class: 'btn btn-file-option', method: :post
+      link_to "Edit", fork_path, class: 'btn', method: :post
     end
   end

app/views/projects/merge_requests/conflicts/_file_actions.html.haml

@@ -8,5 +8,5 @@
       '@click' => "onClickResolveModeButton(file, 'edit')",
       type: 'button' }
       Edit inline
-  %a.btn.view-file.btn-file-option{ ":href" => "file.blobPath" }
+  %a.btn.view-file{ ":href" => "file.blobPath" }
     View file @{{conflictsData.shortCommitSha}}