styling: reduce x padding for code image

Author: Lewis Youl

app/views/modals/snippets/picture.html.erb

@@ -2,7 +2,7 @@
 
 <h5 class="mb-2"><%= @snippet.description %></h5>
 <div data-controller="picture">
-	<div data-picture-target="code" class="bg-cyan p-20">
+	<div data-picture-target="code" class="bg-cyan px-16 py-20">
 		<%= render partial: 'shared/codemirror', locals: { code: @snippet.body, mode_id: @snippet.language_id, read_only: false, capture: true  } %>
 	</div>