Step 1.
Create a new 450X450 pixels document with the white background. Choose the Elliptical Marquee Tool and make a round selection holding Shift.
Step 2.
Set light blue colour to foreground and dark blue to background. Choose the Radial Gradient Tool With "Foreground to Background" and fill the selection from a center to a border.
Step 3.
Create a new layer (Layer 1). Press "D" to reset colours and then "X" to set the white colour to foreground. Choose the Linear Gradient Tool with "Foreground to Transparent" and fill the selection from top to bottom.
Step 4.
Press Ctrl+T and make the selection a little smaller.
If you want to add the text create a new layer (Text Layer) and put it under the Layer 1. And that's it.
