jiguideveloper

I will submit your mainstream site in below CSS Galleries:
Flat Design Gallery & Showcase • An inspirational resource for designers • Flat Inspire
CSS Designs : Web Design Awards and CSS Gallery for Inspiration
CSS Light - Featured Of The Day - Website Awards - CSS Gallery
https://topdesigninspiration.com
https://www.webguruawards.com
http://www.designnominees.com/
https://www.webdesign-inspiration.com
http://www.pagecrush.com
http://www.bestcss.in/
http://unmatchedstyle.com/
http://cssmatter.com/
http://styletheweb.com
http://www.cssmayo.com/
http://www.csswinner.com/
https://topcssgallery.com
https://css.boutique
http://designinspiration.com/
http://cssfox.co/
http://welovewp.com/
and many more..

This is free & premium submission site list.