Yes! It's called css compression/minification. In my opinion, this is the best compressor: https://csscompressor.net/ Paste in your CSS, and it will be compressed. Also, make sure you're using as few selectors as possible in your HTML, go through and see if you can combine them and remove proerties you don't need. Set defaults with this code, so you don't have to write then into each selector at the very top of your main css file. Once you've done that, then cache & Gzip your CSS by adding this to your .htaccess file in the root of your site.

#GZIP ----------------------------
AddOutputFilterByType DEFLATE text/css

<ifModule mod_gzip.c>
  mod_gzip_on Yes
  mod_gzip_dechunk Yes
  mod_gzip_item_include filee \.(html?|txt|css|js|php)$
  mod_gzip_item_include handler ^cgi-script$
  mod_gzip_item_include mime ^text/.*
  mod_gzip_item_include mime ^application/x-javascript.*
  mod_gzip_item_exclude mime ^image/.*
  mod_gzip_item_exclude rspheader ^Content-Encoding:.*gzip.*
</ifModule>

<ifmodule mod_php4.c>
    php_value zlib.output_compression 16386
</ifmodule>

#CACHE ----------------------------

<ifModule mod_headers.c>
  <filesMatch "\\.(css)$">
    Header set Cache-Control "max-age=2592000, public"
  </filesMatch>
</ifModule>
<ifModule mod_expires.c>
  ExpiresActive On
  ExpiresByType text/css "access plus 604800 seconds"
</ifModule>

That should cache and make your css as small as possible. It's what I use on my site and my load time after caching is just under 1 second on a good connection!