.

css/main.css

@@ -1101,7 +1101,8 @@ display: block
     color: darkslateblue;
 }
 
-.inactive {
+.inactive::after {
+    content:  "inactive";
   transform: rotate(12deg);
 	color: #555;
 	font-size: 3rem;

js/main.js

@@ -191,7 +191,7 @@ async function loadExamList(data) {
       c = " session-completed";
     }
 
-    if (!exam.active) {
+    if (!exam.exam_active) {
       c = c + " inactive";
     }