What are some alternatives?
When comparing metro-bootstrap and Metro UI CSS, you can also consider the following products
Bootstrap - Simple and flexible HTML, CSS, and JS for popular UI components and interactions
Material Design Lite - Material Design Lite Components in HTML/CSS/JS
Materialize CSS - A modern responsive front-end framework based on Material Design
Semantic UI - A UI Component library implemented using a set of specifications designed around natural language
Foundation - The most advanced responsive front-end framework in the world
Bulma - Bulma is an open source CSS framework based on Flexbox and built with Sass. It's 100% responsive, fully modular, and available for free.