React cannot set div to take 100% of screen height

All we need is an easy explanation of the problem, so here it is.

I’m trying to make the first div in my App.js take 100% height:

App.css:

body,
html {
  height: 100%;
}

App.js:

function App() {
  return <div style={{ height: "100%", backgroundColor: "red" }}></div>;
}

The App component is rendered as default by index.js:

ReactDOM.render(
  <React.StrictMode>
    <App />
  </React.StrictMode>,
  document.getElementById('root')
);

The result is a blank white screen, not red. Why doesn’t the div rely on the parent (body) and then takes 100% of the height?

EDIT: I cannot use the 100vh trick, I would be happy to know what’s the reason for the direct children of the body that cannot inherit the body’s properties, specifically in React of course

How to solve :

I know you bored from this bug, So we are here to help you! Take a deep breath and look at the explanation of your problem. We have many solutions to this problem, But we recommend you to use the first method because it is tested & true method that will 100% work for you.

Method 1

You can use 100vh (1vh is relative to 1% of the height of the viewport):

function App() {
  return (
    <div style={{ minHeight: "100vh", background: "red" }}></div>
  );
}
ReactDOM.render(
  <App />,
  document.getElementById("root")
);
html,
body {
  padding: 0;
  margin: 0;
}
<script crossorigin src="https://unpkg.com/[email protected]/umd/react.production.min.js"></script>
<script crossorigin src="https://unpkg.com/[email protected]/umd/react-dom.production.min.js"></script>

<div id="root"></div>

Or you have to traverse the DOM tree and make sure all parent elements are 100% height:

function App() {
  return (
    <div style={{ height: "100%", background: "red" }}></div>
  );
}

ReactDOM.render(
  <App />,
  document.getElementById("root")
);
html, body, #root {
    height: 100%;
    margin: 0;
    padding: 0;
}
<script crossorigin src="https://unpkg.com/[email protected]/umd/react.production.min.js"></script>
<script crossorigin src="https://unpkg.com/[email protected]/umd/react-dom.production.min.js"></script>

<div id="root"></div>

Method 2

If you use

height:'100vh'

it works for me.
vh = view height, React seems to respond better to this unit than percent sometimes.

Note: Use and implement method 1 because this method fully tested our system.
Thank you 🙂

All methods was sourced from stackoverflow.com or stackexchange.com, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0

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