Agregar 2 nombres de clase reaccionan
<input className={`form-control round-lg ${this.state.valid ? '' : 'error'}`} />
Lazy Llama
<input className={`form-control round-lg ${this.state.valid ? '' : 'error'}`} />className={[this.state.className, this.props.content.divClassName].join(" ")}
...
var liClasses = classNames({
'main-class': true,
'activeClass': self.state.focused === index
});
return (<li className={liClasses}>{data.name}</li>);
...