function send_rsvp() {
return confirm('Process your RSVP?');
}

-->

:root {
--success_d: green;
--success_l: #8bc34a7a;
--error_d: #e90008;
--error_l: #ff572226;
--warn_d: #ff9800;
--warn_l: #ffeb3b29;
}
body {
font-family: Arial, Helvetica, sans-serif;
margin: 0;
}
.container.warn {
margin: 10px auto 10px;
padding: 5px 20px 5px;
}
.warn, .error, .success {...