score:0

Accepted answer

you need to replace classname with classname ( n capital in classname). it should fix your issue.

try the code given below:

import "./app.css";
function app() {
  return (
    <div classname="wrapper">
      <h1>booklist app</h1>
      <p>add or remove books</p>
      <div classname="main">
        <div classname="form-container"></div>
        <div classname="view-container"></div>
      </div>
    </div>
  );
}

export default app;

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