site: better error messages

this includes styling error messages red, and displaying error messages
in case not all answers were answered as required (for now, this just
means that not selecting any option in radio buttons is disallowed in
general, as so far there are no corresponding config fields).

1 files changed, 4 insertions, 0 deletions

diff --git a/site/style.css b/site/style.css
index e16c0cc..b8be0dd 100644
--- a/site/style.css
+++ b/site/style.css
@@ -20,6 +20,10 @@ li {
     list-style-type: none;
 }
 
+.error {
+    color: red;
+}
+
 textarea {
     width: 100%;
     height: 6em;