Another simple and free alternative is the Paper Bootstrap theme from Bootswatch:
Which is available via CDN: https://www.bootstrapcdn.com/bootswatch/
It's not as polished as the nice library here but it works in a pinch.
Which is available via CDN: https://www.bootstrapcdn.com/bootswatch/
It's not as polished as the nice library here but it works in a pinch.
It's all here: http://mdbootstrap.com/getting-started/