ssl offload server but scrambles web page

Comparing the page source, I get this blocked error

[blocked] The page at https://nagios.drake.edu/nagiosxi/login.php?redirect=/nagiosxi/index.php%3f&noauth=1 was not allowed to run insecure content from http://nagios.drake.edu/nagiosxi/includes/css/font-awesome.min.css?1455902749.

It looks like I need to have a rewrite of the http to https but where do I do the rewrite?

There should be an option in Nagios to not require https.

I ended up using this iRule and it is working properly again. when HTTP_REQUEST {

 Save the requested host value
set host [string tolower [HTTP::host]]

 If the HTTP host header is blank, use the VS IP address
 If the VS IP is not routable for clients, hard code a routable IP
 to replace [IP::local_addr]
if {$host eq ""}{set host [IP::local_addr]}

 Disable the stream filter by default
STREAM::disable

} when HTTP_RESPONSE {

 Check if response type is text and host isn't null
if {[HTTP::header value Content-Type] contains "text" and $host ne ""}{

     Replace http://$host with https://$host
    STREAM::expression "@http://$host@https://$host@"

     Enable the stream filter for this response only
    STREAM::enable

}
 Rewrite the Location header in redirects to https://
if { [HTTP::is_redirect] && [string tolower [HTTP::header Location]] starts_with "http://$host"} {
    HTTP::header replace Location [string map -nocase "http://$host https://$host" [HTTP::header Location]]
}

}