Calculate height of styled-components

For styled-components, how can I fetch the height of any particular div? For example, how can I get the height (100px) of the Outer tag in the code below?

import React from "react";
import ReactDOM from "react-dom";
import styled from "styled-components";

import "./styles.css";

function App() {
  const Outer = styled.div`
    height: "100px";
    border: 1px solid black;
  `;
  return (
    <div className="App">
      <Outer>Inside</Outer>
    </div>
  );
}

const rootElement = document.getElementById("root");
ReactDOM.render(<App />, rootElement);

I have tried Outer.height() but it doesn't work. How can I get the height of Outer tag?

You can add reference to get size of Outer and do this.outerRef.current.clientHeight

Something like that :

const Outer = styled.div`
  height: 100px;
  background: red;
`;

export default class App extends React.Component {
  constructor(props) {
    super(props);
    this.outerRef = React.createRef();
    this.state = {
      outerHeight: 0
    };
  }

  componentDidMount() {
    this.setState({ outerHeight: this.outerRef.current.clientHeight });
  }

  render() {
    return (
        <Outer ref={this.outerRef}>
          {this.state.outerHeight}
        </Outer>
    );
  }
}

You can check on : https://codesandbox.io/embed/6yq239ljlk?fontsize=14

This works but I don't know if it's on this way you need height.