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How to increase default font size on Description

By default font size on description is 12px, I want to change this size to other size. Is there any option to change the default font size value to 16px or 18px.
I'm looking for some option to set default font size to 16px or 18px so that new work items will pick custom value instead of default value.
Please suggest. <o:p> </o:p>
One answer

You may consider using the Web GUI Theming.
https://jazz.net/wiki/bin/view/Main/WebUITheming
Depending on what you want to change about the "font", it can be quite easy or may need some work. For example, changing the type face is pretty easy - just add a custom CSS rule like this.
body {
font-family: "Times New Roman", Georgia, Serif !important;
font-size: 9pt;
}