Add manual ordering styles to issues list

app/assets/stylesheets/pages/issues.scss

@@ -294,3 +294,18 @@ ul.related-merge-requests > li {
     text-align: right;
   }
 }
+
+.manual-ordering {
+  background-color: $gray-light;
+  border-radius: $border-radius-default;
+  padding: $gl-padding-8;
+
+  .issue {
+    background-color: $white-light;
+    margin-bottom: $gl-padding-8;
+    border-radius: $border-radius-default;
+    border: 1px solid $gray-100;
+    box-shadow: 0 1px 2px $issue-boards-card-shadow;
+  }
+}
+