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MUI System - Overview

MUI System is a set of CSS utilities to help you build custom designs more efficiently. It makes it possible to rapidly lay out custom designs.

Introduction

MUI System is a set of CSS utilities to help you build custom designs more efficiently. It's used internally by libraries like Material UI, Joy UI.

MUI System gives you a set of flexible, generic wrapper components like Box and Container that can be quickly customized using the sx prop. This prop lets you define styles directly within the components themselves, rather than creating bulky and redundant const definitions with styled-components. It also gives you direct access to your theme's custom design tokens to ensure consistency in one-off styles. Learn more on the sx prop page.

Advantages of MUI System

  • Write less code: in situations where styled-components would be overkill, the sx prop can replace dozens of lines of code.
  • Write the CSS you already know: the sx prop features a superset of CSS, so it's intuitive to pick up and start working with right away if you're comfortable with CSS.
  • Avoid context-switching: with styled-components, you frequently have to jump between the usage and the definition to find what you need. With MUI System, it's all in one place.
  • Forget unnecessary custom names: if you've ever struggled to come up with a good name for a styled-component, then you'll appreciate skipping that step entirely when using MUI System.