How to change the font size of the site title

Would you please tell me how to change the font size of the site title.
I tried the following with CSS, but both were NG.

div.header-logo {
  font-size: 10px !important;
}

div.header-navbar__start {
  font-size: 10px !important;
}

Regards,

Please try this CSS snippet, and please make sure that you have put this code snippet in Appearance/Customize/Additional CSS field.

.header-logo__name{
  font-size: 10px !important;
}

If the issue persists, and if it is possible, then please provide the screenshot of where the site title is set and the link to your website.

I solved it with your CSS snippet.
Thank you for your support!

Regards,

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