rss2email: Add custom CSS template

host/base/service/coreos-home-server-update

@@ -53,7 +53,7 @@ function sync-coreos-config() {
     done
 
     # Copy files from temporary directory to host configuration directory.
-    cp --verbose --recursive --update --target-directory "$hostdir" "$TEMP_CONFIG_PATH/.tmp/$dirname"/*
+    (cd "$TEMP_CONFIG_PATH/.tmp/$dirname" && cp --verbose --recursive --update --target-directory "$hostdir" -- *)
     printf "done.\n"
 }
 

service/rss2email/container/config/rss2email.conf.template

@@ -7,7 +7,28 @@ date-header = True
 html-mail = True
 multipart-html = True
 use-css = True
-post-process = rss2email.post_process.prettify process
+css =
+    html {
+        max-width: 70ch;
+        padding: 3em 1em;
+        margin: auto;
+        line-height: 1.75;
+        font-size: 1.25em;
+    }
+
+    h1, h2, h3, h4, h5, h6 {
+        margin: 3em 0 1em;
+    }
+
+    img {
+        max-width: 100%;
+    }
+
+    p, ul, ol {
+        margin-bottom: 2em;
+        color: #1d1d1d;
+        font-family: sans-serif;
+    }
 email-protocol = smtp
 smtp-auth = True
 smtp-username = ${RSS2EMAIL_SMTP_USERNAME}