Enigma removing social media icom

I want to remove instagram icon only but when I put this code in child theme of engima (style.css)

[ Moderator note: code fixed. Please wrap code in the backtick character or use the code button. ]

.social li.facebook {
     display: none
}

then both instagram and facebook icon removed.

Both have same class name in the theme

<li class="facebook" data-toggle="tooltip" data-placement="bottom" title="" data-original-title="Facebook"><a href="#"><i class="fa fa-facebook"></i></a>

 <li class="facebook" data-toggle="tooltip" data-placement="bottom" title="" data-original-title="instagram"><a href="#"><i class="fa fa-instagram"></i></a>

https://www.upload.ee/image/5873526/p1.PNG