fixed a bug where first algorithm was not being shown

js/dom/show_first_algorithm.js

@@ -2,6 +2,6 @@
 
 // click the first algorithm in the first category
 module.exports = () => {
-  $('#list button.category').first().click();
-  $('#list button.category + .indent').first().click();
-};
\ No newline at end of file
+  $('#list .category').first().click();
+  $('#list .category + .algorithms > .indent').first().click();
+};