How to use styles in React.js?

Answer

The style attribute accepts a JavaScript object with camelCased properties rather than a CSS string.
This is consistent with the DOM style JavaScript property, is more efficient, and prevents XSS security holes.

const divStyle = {
color: 'blue',
backgroundImage: 'url(' + imgUrl + ')'
};

function HelloWorldComponent() {
return <div style={divStyle}>Hello World!</div>
}
Style keys are camelCased in order to be consistent with accessing the properties on DOM nodes in JavaScript