Do a cross knot where your paracord strands reach the edge of the laptop
Instructions for a cross knot can be found online, though I walk through them in picture form here. Apologies for slight blurriness.
While you're at it, get used to the cross knot. You'll be doing plenty of them. For now, however, just do this with all 4 pairs of your working strands. Make sure you keep them facing front if aesthetics are important to you.