Add dark theme.

templates/login.html

@@ -4,14 +4,24 @@
 
 {% block styles %}
   {{ super() }}
+  <link rel="stylesheet" href="/static/dark_theme.css">
   <link rel="stylesheet" href="/static/custom.css">
 {% endblock %}
 
+{% block body_attribs %}
+  style="background-image: url(/static/img/elite.png);
+    background-repeat: no-repeat;
+    background-position-x: left;
+    background-position-y: bottom;"
+{% endblock %}
+
 {% block content %}
 
   <div class="container vertical-center">
     <div class="card text-center mx-auto" style="width: 15rem">
-      <div class="card-header">Login</div>
+
+      <img src="/static/img/solaire.png" alt="Login" style="height: 15rem">
+
       <div class="card-body">
         <form method="post">
           <div class="form-group">