I see, do you want the result like that https://imgur.com/bthy2Ev ?
The background parallax is correct :), however, the helium header using custom css for margin top and it’s caused the issue. Example:
@media only all and (min-width: 48rem) {
.g-home-particles.g-helium-style #g-header {
margin-top: -9.5rem;
padding: 0;
}}
you can disable the code above and add custom css code for navigation like so
@media only all and (min-width: 48rem) {
.g-home-particles.g-helium-style #g-navigation {
background: transparent;
position: absolute;
z-index: 980;
left: 0;
right: 0;
}}
Thank you