While this page enables you to customize font colors, it does not provide the option to customize the font-family or size. Fortunately, you can use Tumblr's HTML ... Change the Size of Text ...

3. In the Web Content section, click the Font Size drop-down menu. You can choose between multiple sizes of text ranging from Very Small to Very Large, and the changes will take effect immediately.

However, to change the font of text in the description box, you'll need to dig into the code of the theme with the HTML editor and add a single line. How to Change and Edit WordPress Content Height.

and change the font on the fly at any point. First, format some text in a document in a way that you want the default font to look: To format text, select it, then use the formatting toolbar at ...

the underlines are a big help in distinguishing the names of the results from the rest of the text. The blue color and slightly larger font size highlighting the page titles on Google’s results ...