Remove background from actions commit form container

This element is responsive and only shows at the top at this break point, any narrower and the element shows below the editor where it needs a background color.

Author: xt0rted

github-dark.css

@@ -6164,6 +6164,11 @@
   .team-left-column, .render-container.js-actions-page {
     background: none !important;
   }
+  @media (min-width: 1012px) {
+    .file-commit-form--full {
+      background: none !important;
+    }
+  }
   body[class="page-responsive"] .repo-list .private {
     background-color: initial;
   }