Using custom shape, I will show you how easy it is to create a sharp corner style web buttom in Photoshop.

[1]- Choose a new documet size 392x285 pixel and with
white background, now select the Custom shape 

 tool and choose hance pillow shape
, as shown below

[2]- Pick the Custom shape tool and select the pen tool after that right click and select the make selection .

[3]- Now on a a new Layer1 from the Layer window , as shown below

[4]- Fill it with any nice color using Alt+Backspace,

 here I have
selected Blue color

[5]- Now double click on this Layer1 and select the 

Bevel and
Emboss from the Layer window, do not click ok

[6]- Now select the Drop Shadow from the 

layer style and use
the settings below

[7]- Now select the Patteen Overlay 

and use the following settings

[8]- Now again Select the Inner Glow and use

 the following settings
. Now you can click ok

[9]- Your image has been completed . As shown below

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