Instead of adding inline style, create a CSS rule

app/views/spree/shared/_line_item_name.html.haml

@@ -1,4 +1,4 @@
-%h5.inline-header{ style: "background-color: transparent" }
+%h5.inline-header
   = "#{raw(line_item.product.name)}"
   - unless line_item.product.name.include? line_item.name_to_display
     %span= "- #{raw(line_item.name_to_display)}"

app/webpacker/css/darkswarm/split-checkout.scss

@@ -382,6 +382,10 @@
 #line-items {
   display: block;
   overflow-x: auto;
+
+  h5 {
+    background-color: transparent;
+  }
 }
 
 .two-columns-inputs {