How to write the corner of the book in bold?

1. First of all, bold strokes are unified and can only be a decorative font, which can be used to decorate the corner of a book, not calligraphy.

2. Secondly, in the bold type, the horizontal painting is bold on the stroke shape, and the Song shrug angle is flattened into an isoline shape, so that the stroke thickness in the horizontal and vertical directions is consistent.

3. Finally, the corner of the book is a square stroke with a sharp tip and a thin tail and different thickness at the head and tail.