minor style fixes

pages/parameters/teaching.vue

@@ -117,10 +117,16 @@ const goToCycleEditPage = (id: number) => {
 .v-table {
   width: 100%;
   max-width: 800px;
+
+  thead {
+    td {
+      border-bottom: thin solid rgba(var(--v-border-color), var(--v-border-opacity));
+    }
+  }
 }
 
 .cycle-edit-icon {
-  color: rgb(var(--v-theme-primary));
+  color: rgb(var(--v-theme-neutral-strong));
 }
 
 :deep(.cycle-edit-icon .v-icon) {