diff --git a/lib/ace/theme/eclipse.css b/lib/ace/theme/eclipse.css
index 55c34f89..af613b34 100644
--- a/lib/ace/theme/eclipse.css
+++ b/lib/ace/theme/eclipse.css
@@ -101,6 +101,10 @@
   background: rgb(232, 242, 254);
 }
 
+.ace-eclipse .ace_marker-layer .ace_selected_word {
+  border: 1px solid rgb(181, 213, 255);
+}
+
 .ace-eclipse .ace_indent-guide {
   background: url("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAACCAYAAACZgbYnAAAAE0lEQVQImWP4////f4bLly//BwAmVgd1/w11/gAAAABJRU5ErkJggg==") right repeat-y;
 }
\ No newline at end of file