If you familiar with CSS language then you can create a new text styles. The styles you can use on the wiki pages with %your-style%Text with new style.%% command.

Any text styles are stored in the textstyles folder inside user profile (see section Settings File Location). Inline styles are stored inside textstyles/inline folder and block styles are stored inside textstyles/block folder.

To create a new style you need to create a file with .css extension. A name of the file must be corresponded with a style name. For example, if you want create a new block style with a name my-cool-style, you must create a my-cool-style.css file in textstyles/block folder. If you want create an inline style of the same name, you must create a my-cool-style.css file in textstyles/inline folder.

A new .css file must contain CSS code to be inserted on a wiki page code during of parsing. Inline styles will be applied to <span> tag and block styles to <div> tag. So an inline style with a name my-cool-style must contain the code:
span.my-cool-style {
...
}

A block style with the same name must contain the code:
div.my-cool-style {
...
}

A style file may contain any CSS code to be inserted to HTML code of the page.