"gravity-mod.css" Causing Big Problems

Below you will find the pingdom test of my website jewelleryarabia.com.kw
It’s a mutil-site using the enfold theme for 2 separate sites, the main site being http://jewelleryarabia.com.kw

There is a problem with the file” gravity-mod.css” in the enfold theme folder.
I use Gravity forms as a separately installed plugin and the forms are used throughout the site. I’ve tried no-conflict mode in Gravity Forms settings but it makes no difference and keeps throwing up this error and the site is like treacle to wade through.

Can you help? I’ve other sites that replicate this set up but have no issues. I look forward to hearing from you.
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gravity-mod.css?ver=1
jewelleryarabia.com.kw/2017/wp-conten…
0 B Open
0122
Response Headers-1
DateSat, 18 Feb 2017 20:29:46 GMTServerApache/2.4.23 (Unix)Content-Length360Content-Typetext/html; charset=iso-8859-1
Request Headers
Pragmano-cacheAccept-Encodinggzip, deflate, sdchHostjewelleryarabia.com.kwAccept-Languageen-US,en;q=0.8User-AgentMozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/39.0.2171.95 Safari/537.36Accepttext/css,*/*;q=0.1Refererhttp://jewelleryarabia.com.kw/CookiePHPSESSID=pgetc498rrnvva44036mhkb462Connectionkeep-aliveCache-Controlno-cache