_w_i_d_t_h Specifies the width of the bounding rectangle.
_h_e_i_g_h_t Specifies the height of the bounding rectangle.
_s_h_a_d_o_w__t_h_i_c_k_n_e_s_s
Specifies the thickness, in pixels, of the shadow
surrounding the circle.
_m_a_r_g_i_n Specifies the gap, in pixels, between the circle
and its shadow. Without this margin, the boundary
between a circle and its shadow may appear
somewhat ragged on a monochrome screen.
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