How to add style to React Element if it's created this way?

The second parameter to createElement is a hash of attributes where the key is the attribute name and the value is the attribute value. The style attribute takes a hash of style names to values. So, for example:

React.createElement("p", {style: {color: "red", backgroundColor: "blue"}}, this.props.paragraph)

React.createElement("p", {id : 'div1', className : 'news'}, this.props.paragraph)

This way you can use CSS specified in App.css inside in an id/class.