Best CSS Frameworks in 2021

1. Bootstrap
2. Foundation
3. Bulma
4. Tailwind CSS
5. UI Kit
6. Milligram
7. Materialize CSS

Quickly design and customize responsive mobile-first sites with Bootstrap, the world’s most popular front-end open source toolkit, featuring Sass variables and mixins, responsive grid system, extensive prebuilt components, and powerful JavaScript plugins.

2. Foundation

A Framework for any device, medium, and accessibility. Foundation is a family of responsive front-end frameworks that make it easy to design beautiful responsive websites, apps and emails that look amazing on any device.

Link : 

https://get.foundation

3. Bulma

Bulma is the modern CSS framework that just works.
Bulma is a free, open source framework that provides ready-to-use frontend components that you can easily combine to build responsive web interfaces.

Link : 

https://bulma.io

4. Tailwind CSS

Rapidly build modern websites without ever leaving your HTML.
A utility-first CSS framework packed with classes like flex, pt-4, text-center and rotate-90 that can be composed to build any design, directly in your markup.

Link : 

https://tailwindcss.com/

5. UIkit

A lightweight and modular front-end framework for developing fast and powerful web interfaces.

Link :

https://getuikit.com

6. Milligram

Link :

https://milligram.io

7. Materialize CSS 

A modern responsive front-end framework based on Material Design.
To get started, check this :

Link : 

https://materializecss.github.io/materialize

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