To customize this template, you just need to follow commented tag inside of PHP, CSS, and JS files. I already put commented tag on each file to easy way you find any section related to templating & functioning.
Why using PHP file ? because for security question I use PHP session to build it. So file should be in php files.
1. Single Page
2. 2 Files ( main file & thank you file )
3. Validated with w3c validator
1. 2 PHP files
2. Bootstrap CSS package
3. Bootstrap JS package
4. 1 custom CSS styling
5. 1 custom JS styling
6. Font Awesome 4.7