Use Google Fonts by adding a font reference to the CSS
To a question in the Micro.blog Help Center — Can I use Google Fonts with a custom theme?, Manton replied:
Yes, you can use Google Fonts by adding a font reference to the CSS. In Micro.blog, click on Design → Edit Custom CSS and paste in the CSS that you get from Google. It will look something like this:
@import url(‘https://fonts.googleapis.com/css2?family=Roboto:wght@100&display=swap');
body { font-family: "Roboto"; }