Continue with the next instrument to picture a square with the indicated parameters and the necessary layout.

Blending Options-Inner Shadow

Blending Options-Gradient Overlay

Gradient’s parameters

Blending Options-Stroke

Use the brush again to make up in white color, like in the picture

Take another instrument to draw a figure with the color cf2f00, like in the picture.

Paint again in white with the already known brush.

Enlighten the upper part of our figure with the brush and white color.

Take the instrument to represent a square of white color along the inside borders of the grey square. Apply on it to correspond to the picture below. Use the next instrument to erase the unnecessary things.