How to use css container query with mui?

Question

I want to use css container query with mui. My code shall set the background to red, if the parent width is below 300px.

sandbox

const Item = styled("div")(({ theme }) => ({
  border: "solid 1px",
  padding: 100,
  ["@container (max-width: 300px)"]: {
    background: "red",
  },
}));

export default function BasicGrid() {
  return (
    <div>
          <Item>I turn red for width smaller 300 </Item>
    </div>
  );
}

Answer 1

You're example is almost there -- to get the Container Query working, you need to add a container-type to whichever element you want to act as the container. (The square brackets in your example are not needed.)

With your example:

const Item = styled("div")(({ theme }) => ({
  border: "solid 1px",
  padding: 100,
  "@container (min-width: 300px)": { // Corrected your query to min-width and removed brackets
    background: "red",
  },
}));

export default function BasicGrid() {
  return (
    {/* Adds containerType to the "container" element */}
    <div style={{ containerType: "inline-size" }}>
          <Item>I turn red for width smaller 300 </Item>
    </div>
  );
}

I've added a few examples in this sandbox showing more example usage with MUI Grid which produces the following based on the size available to the container.

Large example - Content constrained to 100%:

Smaller example - Content constrained to 300px:

Smallest example - Content constrained to 250px:

Working CodeSandbox: https://codesandbox.io/s/mui-container-queries-gvl4fs
Browser Support: https://caniuse.com/css-container-queries