React

HTML

<div id="app"></div>

CSS

body {
  background: #20262E;
  padding: 20px;
  font-family: Helvetica;
}

#app {
  background: #fff;
  border-radius: 4px;
  padding: 20px;
  transition: all 0.2s;
}

li {
  margin: 8px 0;
}

h2 {
  font-weight: bold;
  margin-bottom: 15px;
}

.done {
  color: rgba(0, 0, 0, 0.3);
  text-decoration: line-through;
}

input {
  margin-right: 5px;
}

React

const green = '#39D1B4';
const yellow = '#FFD712';

class Toggle extends React.Component {
  constructor(props) {
    super(props);
    this.changeColor = this.changeColor.bind(this);
  
    const {name} = this.props;
  }
  
  changeColor() {
      	const newColor = this.props.color;
        this.setState({color: newColor}); 
  }
  
  render() {
  const div = {backgroundColor: 'orange'};
    return (
      <div style={{...div}}>
        <h1>
          Change my color
        </h1>
        <button onClick={this.changeColor}>
          Change color
        </button>
      </div>
    );
  }
}

ReactDOM.render(<Toggle name="propsas" color="lightgreen" />, document.querySelector('#app'));