diff --git a/theme/style.less b/theme/style.less
index 48d39a54..9b5f6b05 100644
--- a/theme/style.less
+++ b/theme/style.less
@@ -13,24 +13,24 @@
 *******************************/
 
 .ui.button.download-button {
-    &:extend(.purple all);
+    &:extend(.ui.purple.button all);
 }
 
 .ui.button.download-button:hover {
-    &:extend(.green all);
+    &:extend(.ui.green.button all);
     color: black !important;
 }
 
-.play-button.play-button-full {
+.ui.button.play-button.play-button-full {
     &:extend(.ui.inverted.button all);
 }
 
 .ui.button.getting-started-btn {
-    &:extend(.orange all);
+    &:extend(.ui.orange.button all);
 }
 
 .ui.button.editortools-btn {
-    &:extend(.blue all);
+    &:extend(.ui.blue.button all);
 }
 
 #filelist, #editortools {
@@ -81,11 +81,6 @@ span.blocklyTreeLabel {
     top: 1.6em;
 }
 
-/* Blockly Toolbox Buttons */
-.ui.button.blocklyAddPackageButton {
-    &:extend(.pink all);
-}
-
 /* Blockly Field: Grid picker */
 .blocklyGridPickerTooltip {
     padding: 3px 5px;