Cleaner workout done indication

Workout.js

@@ -7,6 +7,7 @@ constructor(cont, plan) {
     cont.appendChild(wo_cont);
 
     // Inputs to the class. Workout plan and container to display it in
+    this.arena = cont;
     this.container = wo_cont;
     this.plan = plan;
 
@@ -261,7 +262,7 @@ update_active_item() {
         const wo_done_txt = this.text_element("div", "Workout done!");
         wo_done_txt.classList.add("workout-done-txt");
         wo_done.appendChild(wo_done_txt);
-        this.container.appendChild(wo_done);
+        this.arena.appendChild(wo_done);
     }
 }
 

style.css

@@ -28,8 +28,7 @@ html {
     width: 90%;
 }
 .workout-wrapper.done {
-    color: #777;
+    display: none;
-    background-color: #eee;
 }
 
 .workout-wrapper table {