Allow setting spoiler style via shortcode, move glass shadow to a CSS variable

templates/shortcodes/image.html

@@ -8,6 +8,8 @@
 			{% if pixels %}pixels{% endif %}
 			{% if transparent %}transparent{% endif %}
 			{% if no_hover %}no-hover{% endif %}
+			{% if spoiler %}spoiler{% endif %}
+			{% if spoiler and solid %}solid{% endif %}
 		"
 		{%- if alt -%}alt="{{ alt }}"{%- endif -%}
 		src="{{ url_min }}"
@@ -23,6 +25,8 @@
 			{% if pixels %}pixels{% endif %}
 			{% if transparent %}transparent{% endif %}
 			{% if no_hover %}no-hover{% endif %}
+			{% if spoiler %}spoiler{% endif %}
+			{% if spoiler and solid %}solid{% endif %}
 		"
 		{%- if alt -%}alt="{{ alt }}"{%- endif -%}
 		src="{{ url }}"

templates/shortcodes/video.html

@@ -5,6 +5,8 @@
 		{% if end %}end{% endif %}
 		{% if pixels %}pixels{% endif %}
 		{% if transparent %}transparent{% endif %}
+		{% if spoiler %}spoiler{% endif %}
+		{% if spoiler and solid %}solid{% endif %}
 	"
 	{%- if alt -%}aria-title="{{ alt }}"{%- endif -%}
 	controls src="{{ url }}"></video>