Chart Elements -> Axis Titles-> More Options...
Axis Title Options: Effects
The Axis Title is a Text
Box. By definition, a Text Box is also a Shape. Shapes can be formatted. Here are some options.
4. Try it: Format the Effects
Choose an Effect: Shadow.
Edit the Color: Blue.
There should be a blue shadow under the Primary Horizontal Axis Title.
What Else Do You
See? The Effects include:
Shadow
Glow
Soft Edges
3-D Format
More on that later.
Close the Format Axis Title Options by clicking on the small "x" to the right of the heading Format Axis Title.
Keeeeep going...