Creating our Component

AvatarView.js

import React from 'react';
export class AvatarView extends React.Component {
  mainViewRef = React.createRef()
  render = () => (
    <div
      ref={this.mainViewRef}
      className="avatarView"
      style={{
        display: `${!this.props.showIFrame ? 'none': 'block'}`, 
        height: calc(100vh - 100px);
      }}
    />
  )
}