Polished-metal CTA — gradient + multi-layer shadow stack gives it a tactile chrome finish.
background: linear-gradient(180deg,
var(--chrome-1) 0%, /* near-white top */
#ECEEF0 48%, /* light gray mid-stop */
var(--chrome-2) 56%, /* darker silver after midline */
var(--chrome-3) 100% /* deep silver bottom */
);
The 48% → 56% jump (only 8 percentage points apart) creates a sharp horizontal "reflection line" near the middle — exactly how real polished metal looks. Without that jump, the gradient feels like vinyl.
box-shadow:
inset 0 1px 0 rgba(255,255,255,0.95), /* top inner highlight */
inset 0 -1px 3px rgba(0,0,0,0.12), /* bottom inner shadow */
0 2px 4px rgba(0,0,0,0.08), /* close drop */
0 8px 22px rgba(0,0,0,0.16); /* ambient drop */
Two inset shadows + two outer shadows. Inset top = edge light. Inset bottom = inner darkness, makes the button feel concave-edged. Outer shadows give it lift.
Brass / gold — swap the chrome stops for #fff7d4 → #f0d68c → #b89548 → #8a6e2a. Same gradient logic, different metal.
Dark chrome — invert: dark grays with cyan/blue highlights. Reads as "premium audio gear" / Bose / Bang & Olufsen.
Pressed state — on :active, swap the inset directions and reduce the outer drop. Tactile feedback.
Source: Chevy 55 landing page header CTA (user-uploaded HTML, 2026-05-18).