React[Component Styling] - CSS & SASS

01.Component Styling CSS & SASS

• css에서 scss로 변경하는 과정

App.css 방식의 App.js

import logo from './logo.svg';
import './App.css';

function App() {
  return (
    <div className="App">
      <header className="App-header">
        <img src={logo} className="App-logo" alt="logo" />
        <p>
          Edit <code>src/App.js</code> and save to reload.
        </p>
        <a
          className="App-link"
          href="https://reactjs.org"
          target="_blank"
          rel="noopener noreferrer"
		>
          Learn React
        </a>
      </header>
    </div>
  );
}

export default App;

App.css

.App {
  text-align: center;
}

.App .logo {
  height: 40vmin;
  pointer-events: none;
}

@media (prefers-reduced-motion: no-preference) {
  .App .logo {
    animation: App-logo-spin infinite 20s linear;
  }
}

.App .header {
  background-color: #282c34;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  font-size: calc(10px + 2vmin);
  color: white;
}

.App-link {
  color: #61dafb;
}

@keyframes App-logo-spin {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

실행결과

• http://localhost:3000
  

App.scss 방식의 App.js

import logo from "./logo.svg"
import "./App.css"

function App() {
  return (
    <div className="App">
      <header className="header"> // App-header -> header
        <img src={logo} className="logo" alt="logo" /> // App-logo -> logo
        <p>
          Edit <code>src/App.js</code> and save to reload.
        </p>
        <a
          className="link" // App-Link -> Link
          href="https://reactjs.org"
          target="_blank"
          rel="noopener noreferrer"
		>
          Learn React
        </a>
      </header>
    </div>
  )
}

export default App

• App-header -> header
• App-logo -> logo
• App-Link -> Link

App.scss

.App {
  text-align: center;

  .logo {
    height: 40vmin;
    pointer-events: none;
  }
 
  @media (prefers-reduced-motion: no-preference) {
    .logo {
      animation: App-logo-spin infinite 20s linear;
    }
  }

  .header {
    background-color: #282c34;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    font-size: calc(10px + 2vmin);
    color: white;
  }
 
  .link {
    color: #61dafb;
  }
 
  @keyframes App-logo-spin {
    from {
      transform: rotate(0deg);
    }
    to {
      transform: rotate(360deg);
    }
  }  
}

실행결과

• http://localhost:3000
• ERROR: Cannot find moudle "sass"

에러 원인

• sass 모듈이 없어서 에러가 발생

해결 방안

• sass 모듈 설치

$ npm install sass

실행결과

• http://localhost:3000