CSS Tip

A CSS-only Zig-Zag edge

How much code is needed to create a Zig-Zag edge?

Use an online generator to easily get the code: css-generators.com/custom-borders

A CSS-only zig-zag border

.zig-zag {
  --a: 90deg; /* the angle of the spikes */
  --s: 60px;  /* the size of the spikes */
  
  mask:  
    conic-gradient(from calc(var(--a)/-2) at bottom,
      #000 var(--a),#0000 0) 50%/var(--s);
}

See the Pen CSS only Zig-Zag edge by Temani Afif (@t_afif) on CodePen.

More detail: css-tricks.com/css-borders-using-masks