fix: avoid hover effect of add (item / effect) button being cut off

templates/sheets/shared/components/add-button.hbs

@@ -11,7 +11,7 @@ SPDX-License-Identifier: MIT
 !-- @param title: The title to use for the link element (will be localized)
 !-- @param type: An optional property to use as data-type attribute
 }}
-<div>
+<div class="ds4-add-button">
     <a class="control-{{documentType}}" title="{{localize title}}" data-action="create" {{#if type}}data-type="{{type}}"
         {{/if}}>
         <i class="fas fa-plus"></i>