.htaccess file tools site

 #([^/\.]+)/([^/\.]+)

#RewriteRule ^([^/\.]+)/([^/\.]+)?$ category.php?type$1&tools_category=$2

RewriteEngine On

RewriteRule ^category/([^/\.]+) category.php?tools_category=$1

#below code working for 404 not found page show "Not Found"

#ErrorDocument 404 /404.html

ErrorDocument 404 "<center><h3>Sorry This File Does Not Exist! <a href='../contact-us'>Contact Developer</a></h3><center>"