diff --git a/css/ui.css b/css/ui.css
index 31cf8769..3b499b40 100644
--- a/css/ui.css
+++ b/css/ui.css
@@ -513,7 +513,7 @@ div.asset_block.asset_highlight {
   font-family: "Andale Mono", "Menlo", "Lucida Console", monospace;
   font-weight: bold;
   color: #c1c1b0;
-  background-color: #555;
+  background-color: #4a4a4a;
   border-radius: 8px;
   padding-left: 1em;
 }
@@ -523,6 +523,7 @@ div.asset_block.asset_highlight {
   cursor: pointer;
   padding: 1px 4px;
   border-radius: 4px;
+  background: rgba(153, 204, 153, 0.15);
 }
 .asset_linenos:hover {
   text-decoration: underline;
diff --git a/src/ide/views/asseteditor.ts b/src/ide/views/asseteditor.ts
index 5516d165..23dbab3f 100644
--- a/src/ide/views/asseteditor.ts
+++ b/src/ide/views/asseteditor.ts
@@ -351,6 +351,7 @@ export class AssetEditorView implements ProjectView, pixed.EditorContext {
           .appendTo(this.ensureFileDiv(fileid));
         var snip = $('<div class="asset_snip"/>').appendTo(block);
         var linenos = $('<span class="asset_linenos"/>').appendTo(snip);
+        $('<span class="asset_lineno"/>').text('↗ ').appendTo(linenos);
         $('<span class="asset_lineno"/>').text(frag.startline).appendTo(linenos);
         linenos.append('-');
         $('<span class="asset_lineno"/>').text(frag.endline).appendTo(linenos);