FIX: broken transparency property in hero_section

sass/_utils.scss

@@ -46,6 +46,15 @@ figure.image>figcaption {
       .box {
         color: black;
       }
+
+    }
+    .container.is-transparent {
+      bottom: 0 !important;
+      opacity: 1;
+      .box {
+        background: none;
+        box-shadow: none;
+      }
     }
   }
 

templates/shortcodes/hero_section.html

 <section class="hero is-fullheight-with-navbar {% if background_img %}has-background{% endif %}">
   {% if background_img %}
     {% set image = resize_image(path="@/" ~ page.colocated_path ~ "/" ~ background_img, width=800, height=600) -%}
-  <img class="hero-background" src="{{ image.url }}" alt="">
+  <img class="hero-background {% if background_transparent %}is-transparent{% endif %}" src="{{ image.url }}" alt="">
   {% endif -%}
   <div class="hero-body pl-0 pr-0">
-    <div class="container has-text-centered">
+    <div class="container has-text-centered  {% if background_transparent %}is-transparent{% endif %}">
       <div class="box is-radiusless">
         <h1 class="title is-1 mb-5">{{ title | default(value=page.title) | safe }}</h1>
         {% if body or page.description %}<p class="subtitle">{{ body | default(value=page.description) | safe }}</p>{% endif -%}