[React] Style the body element with styled-components and "injectGlobal"

In this lesson, we see how we can apply styles globally with the "injectGlobal" helper method in styled-components. This method allows us to apply styles on the body element, which cannot be wrapped in a styled-component.

You might use the global css like this:

body {
  margin:;
  font-family: -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    Roboto,
    Helvetica,
    Arial,
    sans-serif,
    "Apple Color Emoji",
    "Segoe UI Emoji",
    "Segoe UI Symbol";
}

So in the app, you need to import css file:

import './App.css'

With style-component, we can use injectGlobal to remove the css file:

import styled, { injectGlobal } from "styled-components";

injectGlobal`
  body {
    margin: 0;
    font-family: -apple-system,
      BlinkMacSystemFont,
      "Segoe UI",
      Roboto,
      Helvetica,
      Arial,
      sans-serif,
      "Apple Color Emoji",
      "Segoe UI Emoji",
      "Segoe UI Symbol";
  }
`;