Your colleague continues to make mistakes. The HTML document and styles are written again.
And the styles are even connected, but again nothing works. Most likely, the error lies in the path to the stylesheet.
Correct the path to the external styles in index.html.

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css/styles.css

h1 {
    text-align: center;
}

p {
    color: olivedrab;
}

index.html

<!DOCTYPE html>
<html>
  <head>
    <title>History</title>
    <link rel="stylesheet" type="text/css" href="./styles.css">
  </head>
  <body>
    <h1>History of programming languages</h1>
    <p>In the 1940s, the first recognizably modern electrically powered computers were created.</p>
    <p>The limited speed and memory capacity forced programmers to write hand-tuned assembly language programs.</p>
  </body>
</html>