title: css file changes influence the whole application instead of specific model
body: <p>I am using css in my react application in that way :</p>
  
  <pre><code>import styles from "./register.module.css";
  
  &lt;div className={styles.banana}&gt;
  Hello
  &lt;/div&gt;
  </code></pre>
  
  <p>Today I made some changes to one of my css modules and realised that it changes the whole application. For example, if I add margin-top to <code>&lt;h1&gt;</code> in one of my css files, it will change all the <code>&lt;h1&gt;</code> in the entire application, even though other models aren't even importing this css file.</p>
  
  <p>What may be the cause to this issue?</p>