In the world of MUI, how should one interpret the symbols '&', '>', and '*' when used together?

Currently, I am in the process of building a website using React. To help with this project, I purchased a Material-UI React template. As I was going through the code, I came across the line 4 where it mentions '& > *', and I'm not quite sure what it means.

Could someone clarify whether '& > *' is just a property name or if it signifies something specific in the code?

const useStyles = makeStyles((theme) => ({
    card: {
        maxWidth: '475px',
        '& > *': {
            flexGrow: 1,
            flexBasis: '50%'
        },
        [theme.breakpoints.down('sm')]: {
            margin: '20px'
        },
        [theme.breakpoints.down('lg')]: {
            maxWidth: '400px'
    },
    content: {
        padding: `${theme.spacing(5)} !important`,
        [theme.breakpoints.down('lg')]: {
            padding: `${theme.spacing(3)} !important`
        }
    }
}));
cssreactjsmaterial-ui

Answer №1

When using a css compiler like scss, the sign & is related to it. The symbol * indicates all elements, while > signifies a direct child.

In essence, it will target the element within its scope, as shown in this example:

// styling for the card element
card: {
        maxWidth: '475px',

        // styling for all direct children of the card element
        '& > *': {
            flexGrow: 1,
            flexBasis: '50%'
        },
}

Answer №2

The CSS greater than sign (>) selector is a powerful tool for choosing specific elements that have a particular parent element. This selector, also known as the child combinator selector, targets only direct children of a parent, not any deeper levels in the hierarchy. Elements that are not immediate offspring of the specified parent will not be affected by this selector.

The use of the & character signifies "this" in CSS. Here are some examples:

p { font-weight:bold; &:hover { color:red; } }

Answer №3

// This code snippet targets all elements that are children of a <card> element
card: {
        '& > *': {
            flexGrow: 1,
            flexBasis: '50%'
        }
}

// It is equivalent to the following CSS

card > * {
    flex-grow: 1;
    flex-basis: 50%;
}

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