WP-Admin gives 403 Forbidden after login on CentOS 7

Add this in your .htaccess file at website root folder.
If you deleted it then create it again and paste this.

DirectoryIndex index.html index.php

# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>
# END WordPress

EDIT

Looks like you have issue with DirectoryIndex.
In your httpd.conf search for DirectoryIndex and make sure you add index.php in it.
Or in your virtual host configuration.

Like this.

DirectoryIndex index.html index.htm index.php