A simple tutorial, which teach you how to make an “Aqua” style button with only 6 simple steps.

Step 1: Create a new file and set up the values.As mine,i put 200 x 60

Step 2:Use Rounded Rectangle Tool with Radius of 30px, draw out the shape with color #00C0FF

Step 3:Create another shape with Rounded Rectangle Tool like the pic below

Step 4:Use Blending mode>Gradient Overlay for the shape you created just now with settings like below

Step 5:Use Rectangula Marquee Tool to make a selection like below

Step 6: Use Gradient Tool and drag from bottom to up with color #00F6FF from alpha 100% -> 0% on the selection you just made.You will have the result like this