using style in react code example

Example 1: inline style jsx

//Multiple inline styles
<div style={{padding:'0px 10px', position: 'fixed'}}>Content</div>

Example 2: react jsx style with calc

If you need some more specific CSS you need to put it into quotes - react inline styles doc

<div style={{width: 'calc(100% - 276px)'}}></div>
In your exact case

customFormat = 'hello-div'
divStyle = {width: 'calc(100% - 276px)'}
return (
    <div className={customFormat} style={divStyle}>
      Hello World
    </div>
)
In case you need to overwrite multiple widths (fallbacks) for browser compatibility

divStyle = {width: 'calc(100% - 276px)',
    fallbacks: [
        { width: '-moz-calc(100% - 276px)' },
        { width: '-webkit-calc(100% - 276px)' },
        { width: '-o-calc(100% - 276px)' }
]}

Example 3: Styling React Using CSS

class MyHeader extends React.Component {
  render() {
    return (
      <div>
      <h1 style={{color: "red"}}>Hello Style!</h1>
      <p>Add a little style!</p>
      </div>
    );
  }
}

Example 4: react add inline styles in react

// You are actuallty better off using style props
// But you can do it, you have to double brace
// and camel-case the css properties
render() {
	return (
    	<div style={{paddingTop: '2em'}}>
      		<p>Eh up, me duck!</p>
      	</div>
    )
}

Example 5: use styles in react

const useStyles = makeStyles(theme => ({
  textField: {
    marginLeft: theme.spacing(1),
    marginRight: theme.spacing(1),
    border: '1px solid red',
  },
}));
function App() {
  const classes = useStyles();
return (
    <TextField
      id="outlined-name"
      label="Name"
      className={classes.textField}
      margin="normal"
      variant="outlined"
    />
  );
}

Example 6: inline style react

// Typical component with state-classes
<ul className="todo-list">
  {this.state.items.map((item,i)=>({
<li 
 className={classnames({ 'todo-list__item': true, 'is-complete': item.complete })}>
            {item.name}
</li>
 })}
</ul>

// Using inline-styles for state
<li className='todo-list__item'
 style={(item.complete) ? styles.complete : {}} />

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Css Example