Using the Rounded Rectangle Tool, set the corner radius to 40px,
hold down the shift key and create a rounded corner square that
fills the screen from top to bottom. Rotate this square
45degrees. Move it up, till the bottom point is sitting in the
middle of your envelope. Then Edit/Transform Path/Resize till
the outer corners meet the top & edges of your cover. Layer/Rasterize/Layer.
Use the Crop Tool to eliminate all of the square that is outside
the workspace. Trim away any excess that lies between your cover
and the edge of the workspace. Use the eyedropper to get the
color of the darkest place on your cover, then change the color
to several shades darker. Go to Edit/Stroke, 1px, inside, Color
Burn. Adjust the opacity by 35% so it is more subtle. We just
created the top flap of the cover. Duplicate the layer,
Select/All, Edit/Transform/Flip Vertical. We just created the
Move that layer backward. Duplicate the layer and rotate it
90degrees to the left edge of your cover then resize it till the
top and bottom line up with the edges of the cover. Duplicate
the layer, Select/All, Edit/Transform/Flip Horizontal.
After lining up all the outside edges, merge the four flaps into
a single layer. Change the blending mode to Darken. Make the
Background layer invisible, and Layer/Merge Visible.
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