custom development environment (cant find style.css)

Im new to wp development and im used to have a custom development environment using gulp. So i have a folder called development where i store all my development folders and files. In this folder i have index.php, functions.php and style.css. However, wp says it cant find the stylesheet. The absolute path to the file is builds/development/style.css etc, however the relative path of style.css (to the index.php) should be good enough, right?. How to fix this?

image of my file structure http://www.bild.me/bild.php?file=2452032environment.png