Avoid Using "background-attachment: fixed" with background-image:(url("./assests/bg.png")) without fallback or will get bug in mobile first Design...

. hero {

background-image: url('banner.jpg');

background-size: cover;

background-position: center;

background-attachment: fixed;

height: 100vh;

}

• Doesn't always work on mobile browsers (especially iOS Safari)

• Some devices disable it by default for performance reasons

• If you want cross-device parallax, you'd need JavaScript solutions or CSS tricks using transform/position: sticky.

• better solution to avoid this kind of performance issue is using fallback or responsive version of background-attachment: fixed; with @media that will make it degrade gracefully on phones too.

• so, the solution is as follows

• .hero {

• background-image: url('banner.jpg');

• background-size: cover;

• background-position: center;

• background-attachment: fixed; /* desktop parallax effect */

• height: 100vh;

• display: flex;

• justify-content: center;

• align-items: center;

• color: white;

• text-align: center;

• }

  @media (max-width: 768px) {

• .hero {

• background-attachment: scroll; /* fallback for mobile */

• }

• }