The number 192 at the end is the alpha (transparency) value for the border. It’s on a 0–255 scale where:
0 = fully invisible (completely transparent)
255 = fully solid (no transparency)
192 ≈ 75% opaque (about 25% see-through)
So for BorderColor=#0423ee,ttl,6,192:
#0423ee = border color (blue)
ttl = show the border only when the mouse is over the title bar
6 = border width in pixels
192 = the border’s opacity (about 75% opaque)
If you omit the fourth value the code defaults to 192. Use a lower number to make the border more see-through (e.g., 128 ≈ 50% opaque) or 255 to make it completely solid.
Performance note: A fully solid border (alpha = 255) avoids extra transparency compositing and is less likely to affect FPS. Transparent borders (alpha < 255) require additional compositing and on some systems or GPUs may cause a small drop in frame rate when the border is visible, and can cause higher CPU/GPU usage while watching videos.
Performance note: A fully solid border (alpha = 255) avoids extra transparency compositing and is less likely to affect FPS. Transparent borders (alpha < 255) require additional compositing and on some systems or GPUs may cause a small drop in frame rate when the border is visible, and can cause higher CPU/GPU usage while watching videos.