Os: Centos

File: httpd.conf

Make sure that :

AllowOverride All

<Directory "/var/www/html">
 #
 # Possible values for the Options directive are "None", "All",
 # or any combination of:
 # Indexes Includes FollowSymLinks SymLinksifOwnerMatch ExecCGI MultiViews
 #
 # Note that "MultiViews" must be named *explicitly* --- "Options All"
 # doesn't give it to you.
 #
 # The Options directive is both complicated and important. Please see
 # http://httpd.apache.org/docs/2.4/mod/core.html#options
 # for more information.
 #
 Options Indexes FollowSymLinks

 #
 # AllowOverride controls what directives may be placed in .htaccess files.
 # It can be "All", "None", or any combination of the keywords:
 # Options FileInfo AuthConfig Limit
 #
 AllowOverride All
<IfModule mod_rewrite.c>
 RewriteEngine On
 RewriteBase /blog/
 RewriteCond %{REQUEST_FILENAME} !-f
 RewriteCond %{REQUEST_FILENAME} !-d
 RewriteRule . /blog/index.php [L]
 </IfModule>
 #
 # Controls who can get stuff from this server.
 #
 Require all granted
</Directory>

Dont forget to restart httpd service after saving the file httpd.conf: 

systemctl restart httpd