Center and increase size of text using GitHub MarkDown in summary block without new line (aligned with the summary arrow)

Question

I would like to create a summary in a README.md markdown file from GitHub with increased size of text, centered, and in the same line as the arrow that <summary> creates.

Currently I am able to create the summary but with small text and not centered. If I try to center it with <center> or align="center", or increase the size of the text with <h3> My projects: </h3> the summary appears in a new row, not aligned with the arrow that <summary> creates:

• Without trying to align:

<details>
    <summary>
         My projects: 
    </summary>
    my user stats
</details>

• With aligning:

<details>
    <summary>
        <center> My projects: </center>
    </summary>
    my user stats
</details>

I have been researching the problem and it seems that avoiding the creation of a new line in GitHub Markdown is a thing that some people have been struggling with.

So basically what I need is

<details>
    <summary>
         My projects (this text has to be aligned with the arrow, centered and with increased font size in GitHub markdown): 
    </summary>
    my user stats
</details>

Thank you for your help!