Step 1
Make a new document 500x500 pixels. Make the background
layer a dark grey so we can see what we are doing. Once you've done that
make a new layer and call it micro button. Select your rectangle marquee
tool and make a fixed slection of 150x19. Then go to select
> modify > smooth and then enter in 4.
Step 2
While selected on the layer "micro button" simply go to Layer
> Layer Style > Blending Options > Inner Shadow once you've
done that enter in the details as shown below.
Step 3
Now select the Bevel and Emboss and enter in the setting as shown below:
Step 4
Now select the Gradient Overlay and enter in the setting below:
Step 5
Select Gradient option and do as followed.
Final Result
You should now have something that looks a bit like the image shown below.
I used the font Verdana and size 10px for the font. Play around and see
what you can come up with.