(fp_line (start 10.16 6.86) (end 10.16 10.8) (layer F.SilkS) (width 0.381)) (fp_line (start 0 6.86) (end 0 10.8) (layer F.SilkS) (width 0.381)) (fp_line (start -10.16 ...

To change the shader, create a texture pack with a file called menu-shader.fsh. For a few already made shaders, check out this Twitter X thread. This mod also supports some Shadertoy shaders, to use ...