Theme CSS not working because of Version Number

I mentioned theme name in config.php and basic theme is working fine. Theme not over-riding css because of version number next to styles.css e.g. styles.css**?v=9955545a59457d44b432e4fe7ec3fd5c**

Made a theme called “mytheme” I copied core/css/styles.css into themes/mytheme/core/css/styles.css

When I open mysite.com/themes/mytheme/core/css/styles.css in browser without version number then browser shows me latest/edited css but when I open mysite.com in browser then theme not over-riding the css because of version number. I tried after clear my browser cache and I also stopped cache in apache proxy server but nothing change.

Please Help

# DISABLE ALL APACHE PROXY CACHING WHILE DEVELOPING
<FilesMatch "\.(html|htm|js|css|json)$">
FileETag None

  <IfModule mod_headers.c>
    Header unset ETag
    Header set Cache-Control "max-age=0, no-cache, no-store, must-revalidate"
    Header set Pragma "no-cache"
    Header set Note "CACHING IS DISABLED ON LOCALHOST"
    Header set Expires "Wed, 11 Jan 1984 05:00:00 GMT"
  </IfModule>
</FilesMatch>