You can change the appearance of the NumericTextBox by adding custom cssClass to the component and enabling styles. Refer to the following example to change the appearance of the NumericTextBox.
import * as React from "react";
import * as ReactDOM from "react-dom";
import { NumericTextBoxComponent } from '@syncfusion/ej2-react-inputs';
// initializes NumericTextBox component
export default class App extends React.Component<{}, {}> {
render() {
return (
<NumericTextBoxComponent id="sample" value={10} cssClass={'e-style'} placeholder="Enter value" floatLabelType={'Always'}/>
);
}
}
ReactDOM.render(<App />, document.getElementById('numericContainer'));