I want to adjust the font size of web content

Hello：

Everyone!

In web page composer there are many web content types,such as wpc_webbanner,wpc_weblinklist, wpc_webfeature, wpc_webeditor and so on.

Now I want to adjust the font size of web content ,but I don't know how and where adjust the font size of web content?

Who can help me?

lexian