How to change a style of an element in React.js in onClick function

I am trying to change the color of list elements in my conditional rendering in react.js.

onClick={exist ? () => {this.handleClick(); this.props.updateSummary(store_id)} : null }

I want to have style="color :#E8E8E8" and not :null. It seems like I can not use inline styling in onClick function while doing conditional rendering. Any ideas how to do it? Thank you

<ul>
   {this.props.stores.map(({exist, store_id}) => (
      <li className ="storeIdList" onClick={exist ? () => {this.handleClick(); this.props.updateSummary(store_id)} : null }>Store Id: {store_id}</li>
   ))}
</ul>