remove class react
You can make use of the state to store the active div and then conditionally add active class to it
class Hello extends React.component{
state = {
active: ''
}
addActiveClass(e){
const clicked = e.target.id
if(this.state.active === clicked) {
this.setState({active: ''});
} else {
this.setState({active: clicked})
}
}
render() {
return (
<div>
<div className={`red green blue ${this.state.active === "first"? 'active': ''}`} id="first" onClick={this.addActiveClass}>Hello World</div>
<div className={`red green blue ${this.state.active === "second"? 'active': ''}`} id="second" onClick={this.addActiveClass}>Good Bye World</div>
</div>
)
}
}