Now create a new layer and add a background color to your design.
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Click the Add a Layer Style icon at the bottom of the Layers Palette, and select <Stroke> from the menu.
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Choose the settings you want in the Layer Style dialog box, including color, size, and position of the stroke. For example, create a blue, 10-pixel border around your graphic.
Want to try more? Experiment with Photoshop’s Layer Style choices.