SMaterial the open-source CSS framework which is inspired on Google's Material Design.
It is build as responsive mobile first and is easily changed with SCSS variables.
SMaterial is still in heavy development but do you like to help / contribute? Feel free to do here.
The framework is build with SCSS and there for easy customizable with variables.
For CSS there is always a prefix to prevent overwriting classes.
The use of Webpack should also speed up your development.
Because SMaterial is open-source feel free to commit your additions and or problems.
Because the framework is based on Material Design users who are already familiar with Android will have no trouble
getting to know your website.