diff --git a/js/main.js b/js/main.js
index bc128194..fa8db4a0 100644
--- a/js/main.js
+++ b/js/main.js
@@ -245,6 +245,8 @@ const MM = (function () {
 		if (moduleWrapper !== null) {
 			moduleWrapper.style.transition = "opacity " + speed / 1000 + "s";
 			moduleWrapper.style.opacity = 0;
+			moduleWrapper.className = moduleWrapper.className.split(" shown").join("");
+			moduleWrapper.className += " hidden";
 
 			clearTimeout(module.showHideTimer);
 			module.showHideTimer = setTimeout(function () {
@@ -310,6 +312,8 @@ const MM = (function () {
 			moduleWrapper.style.transition = "opacity " + speed / 1000 + "s";
 			// Restore the position. See hideModule() for more info.
 			moduleWrapper.style.position = "static";
+			moduleWrapper.className = moduleWrapper.className.split(" hidden").join("");
+			moduleWrapper.className += " shown";
 
 			updateWrapperStates();