Fortunately, Tumblr enables you to change the font size for your blog's text by giving you direct access to the raw CSS or Cascading Style Sheet code of your theme. Log in to your Tumblr blog.

Can a 3D Minecraft implementation be done entirely in CSS and HTML, without a single line of JavaScript in sight? The answer ...

Replace the value after "font-size:" with a font size expressed in pixels followed by a semicolon. For example, enter "font-size: 12px;" (without the quotations).