diff --git a/theme/style.less b/theme/style.less
index 9cfb478e..1680b90e 100644
--- a/theme/style.less
+++ b/theme/style.less
@@ -45,7 +45,7 @@
              Blockly
 *******************************/
 
-.blocklyTreeRow {
+div.blocklyTreeRow {
     border-bottom: 1px solid #ecf0f1 !important;
     margin-bottom: 0px !important;
 
@@ -56,7 +56,7 @@
 }
 
 /* Blockly toolbox font size same as the page font */
-.blocklyTreeLabel {
+span.blocklyTreeLabel {
     font-family: @pageFont !important;
     font-weight: 200;
 }