centering bug with a Nunito font

when I use <link href="https://fonts.googleapis.com/css2?family=Nunito:wght@300;400;700&display=swap" rel="stylesheet"> then my text <div style="text-align:center"><h1><b>Study Orbit</b></h1></div> doesn't want to get centered.
Any help will be appreciated. I am a beginner.