Multiple Ui fixes (#6272)

* PLT-6453 - Improving headings in the web app

* PLT-6414 - Fixing view members modal issue

* PLT-5863 - Fixing alignment in new channel menu

* PLT-6391 - Fixing code block overlay

webapp/sass/layout/_forms.scss

@@ -71,7 +71,7 @@
 
     .form__label {
         &.control-label {
-            color: inherit;
+            color: inherit !important;
         }
     }