create a "plain" style with next to no CSS

this clarifies the value of what was formerly "style.css" a bit, and
also opens the door for potential styles that don't inherit the base
styling at all

incorporealcms/lib.py

@@ -34,6 +34,7 @@ def render(template_name_or_list, **context):
     PAGE_STYLES = {
         'dark': 'css/dark.css',
         'light': 'css/light.css',
+        'plain': 'css/plain.css',
     }
 
     selected_style = request.args.get('style', None)

incorporealcms/static/css/dark.css

@@ -1,3 +1,5 @@
+@import '/static/css/base.css';
+
 html {
     color: #CCC;
 }

incorporealcms/static/css/light.css

@@ -1,3 +1,5 @@
+@import '/static/css/base.css';
+
 html {
     color: #222;
 }

incorporealcms/static/css/plain.css

@@ -0,0 +1,8 @@
+
+.img-25 {
+    max-width: 25% !important;
+}
+
+.img-50 {
+    max-width: 50% !important;
+}

incorporealcms/templates/base.html

@@ -7,7 +7,6 @@
 <meta property="og:url" content="{{ base_url }}">
 <meta name="twitter:card" content="summary_large_image">
 <meta name="viewport" content="width=device-width, initial-scale=1">
-<link rel="stylesheet" href="{{ url_for('static', filename='css/style.css') }}">
 <link rel="stylesheet" href="{{ url_for('static', filename=user_style) }}">
 <link rel="icon" href="{% if config.FAVICON %}{{ config.FAVICON }}{% else %}{{ url_for('static', filename='img/favicon.png') }}{% endif %}">
 
@@ -23,6 +22,7 @@
         <div class="styles">
             <a href="?style=dark">[dark]</a>
             <a href="?style=light">[light]</a>
+            <a href="?style=plain">[plain]</a>
         </div>
     </div>
     {% endblock %}