fix minor styling issue

templates/voting.html

@@ -197,7 +197,7 @@
             <div class="categories" id="container">{% for category_name, is_in_category in song.categories.items() %}{%
                 if is_in_category %}<span style="--hue: {{ all_categories[category_name] / all_categories|length }};">{{
                     category_name }}</span>{%
-                endif %}{% endfor %}<span style="--main-color: transparent;">&nbsp;</span>
+                endif %}{% endfor %}<span style="--main-color: transparent; --hue: transparent;">&nbsp;</span>
             </div>
             <div class="vote-buttons">
                 <div class="button button-no {% if (song.vote == -1) or (not song.vote and not song.singable) %}selected{% endif %}"