[O] Move clickable to global css

src/components/app/app.scss

@@ -64,3 +64,9 @@ div.el-card.course-card > div.el-card__body
     padding-right: 0 !important;
     padding-left: 0 !important;
 }
+
+// Clickable text
+.clickable:hover
+{
+    text-decoration: underline;
+}

src/pages/overall/overall-course/course-head/course-head.vue

@@ -75,11 +75,6 @@
             color: var(--main);
         }
 
-        .course-name.clickable:hover
-        {
-            text-decoration: underline;
-        }
-
         .course-teacher
         {
             font-size: 12px;