Fix: Navbar hover behavior (coscine/issues#1911)

coscine/issues#1911

src/components/Page/Header.vue

@@ -40,10 +40,7 @@
         </li>
       </ul>
       <div>
-        <b-dropdown id="helpDropdown" text="?" class="dropdown " variant="dark" no-caret>
-          <template #button-content>
-            <span class="?">?</span>
-          </template>
+        <b-dropdown id="helpDropdown" text="?" class="dropdown noHover" variant="dark">
             <b-dropdown-item href="https://help.itc.rwth-aachen.de/service/7ab6210773b04ef28a1a8cb33628be67">
             Help
             </b-dropdown-item>
@@ -100,6 +97,10 @@ export default Vue.extend({
   padding-top: 0.5rem !important;
 }
 
+  .noHover {
+        background-color: transparent !important;
+      }
+
 .siteIcon {
   height: 0px;
   width: 0px;